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Questions tagged [cylinder-head]

Cylinder heads (commonly just called "heads") are the big piece of metal which caps and seals the end of the cylinder bore.

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Can I use an opened head gasket?

Note: I am NOT asking about re-using an old head gasket. Super newbie paranoid question here! I am wondering if I can use a brand new head gasket where I opened the packaging about a month ago. The &...
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piece of porcelain fell into cylinder,

I have a 2003 chevy trailblazer, I was changing the coil packs and plugs and one of the plugs was broken and a piece of porcelain went into the cylinder. I thought that I got it all out,but I did not, ...
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What are these two holes in the cylinder head? (Suzuki M13A engine)

I changed the valve cover gasket on my 2004 Suzuki Wagon R+. The cylinder head looks like this (for reference, the engine has 201.000km): What are the two holes I circled? They don't have anything ...
Szak1's user avatar
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Maximum valve clearances. How big is too big?

I have a 1700 Leyland "O series" engine which has what I believe to be a direct overhead cam (OHC). The lobes on the overhead cam push directly down on buckets with shims. I have just ...
Michael Sherpa's user avatar
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Why are sheet metal engines not popular?

What are the reasons engines use casting and not stamping when manufacturing blocks and heads? There were couple of stamped engines before but none of them took off. https://www.macsmotorcitygarage....
Timothy Scherer's user avatar
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Tube holding spark plug spinning with spark plug

I have been trying to replace the spark plugs on my talbot express 1989, I have been having some trouble with getting the 21mm spark plug tool to fit into the spark plug hole, however after shaving ...
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Valves in pizza box fell out does order matter if lapping

I had my valves numbered in a pizza box for lapping and i lifted the pizza box up the wrong way and every valve fell to the floor. i can tell intake apart from exhaust easily because they look ...
User Name's user avatar
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What tools and/or equipment is needed to replace the cylinder head on a 2003 Chevrolet Trailblazer 4.3L V6?

So, I was away for a few months and when i returned, my vehicle had a cracked cylinder head. Long story, but i got a replacement cylinder head. I know a little about cars, but far from a master ...
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2010 Subaru Legacy 2.5L CVT - Torque Sequence / Specs for Cylinder Head Bolts

I can't seem to find the specs for this model year online anywhere.
Tyler N's user avatar
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Understanding the process of tightening head bolts properly

In some cars like some Peugeot & Citroen models, there is a specific stage during the process of tightening the head bolts. For example, in Haynes manual of Peugeot 405 it is stated that head ...
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What is the cause of head gasket failure between cylinders?

I have 4 cylinder Renault Clio gasoline car with 150 000 km. I had my head gasket replaced, because it blew between cylinders(rough idle,..) It was cheap job, new gasket held nicely, but then some ...
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Adjacent exhaust valves in a cylinder head

There are some engines in which you can see two adjacent exhaust valves in cylinder head. The following head (Chevrolet Small Block) is an example: Is it true that this particular head design causes ...
LFY MP7.3's user avatar
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Reverse flow head vs Cross flow head

Wikipedia says that Cross Flow cylinder heads induct the charge better because the gases doesn't have to change direction from intake to exhaust. Thus the higher inertia of flow of gas in one ...
Abhishek P G's user avatar
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2004 Lincoln Navigator 5.4L 32v DOHC Broken Lower Intake Manifold Bolt in LH Cylinder Head

What started off as a broken heater hose quick disconnect that dumped all the coolant and tripped the cylinder head iverheat protection ended up with me removing all hoses, upper intake/plenum, both ...
tedallen's user avatar
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4.3l V6 chevy head bolt placement for long and short bolts

Putting back together my chevy silverado 2001 4.3l V6 after head gasket replacement and I don't remember where the 2 short bolts go in the head. I find plenty of info on the torque specs and ...
Trendkill's user avatar
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160 views

Likelihood of every piston ring corroding the same rate

I performed a rebuild of my both cylinder heads on a V6 engine, in order to grind leaky valves. I performed a test of each valve pouring isopropyl alcohol in the intake/exhaust chamber and waiting ...
amphibient's user avatar
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Understanding "torque-to-yield" concept

Can you help me understand the general "torque-to-yield" concept, which is often used for head bolts. In the case of my Tacoma, the head bolts are specified to be torqued to a spec of 27 ft/...
amphibient's user avatar
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3 votes
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Cleaning head bolt shafts

I am about to put my two cylinder heads back in and did some preliminary finger fitting of a bolt in every one of the 16 shafts to make sure it goes in smoothly, i.e. no gunk/debris impeding the fit. ...
amphibient's user avatar
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How many times can you go through a torque sequence when installing heads? I'm worried I messed up and should try again but don't wanna make it worse

2002 Ford Escape Cylinders 123 456 Rear Bolt Order (see picture below) 8426 7135 Front Bolt Order 7135 8426 Torque Sequence 1 30 ft lb 2 tighten 90 deg 3 loosen 360 deg 4 30 ft lb 5 turn 90 deg 6 turn ...
user875234's user avatar
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What type of valve spring compressor tool do you use in a 2002 Ford Escape?

It'd be awesome if the engine had a name because I know other makes and models use the same engine. Anyhow I know OEMTOOLS 27040 doesn't fit because I tried it already. I was thinking of trying ARES ...
user875234's user avatar
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How much should you clean dirty pistons and valves when you aren't removing them?

I took the heads off so I could get some broken exhaust manifold studs out and retap (actually I was advised to use a Heli-Coil instead so doing that) one of the other stud holes. The piston heads and ...
user875234's user avatar
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Trying to find out if it was the head gasket or not

My 98 Ford Ranger's radiator cap stopped sealing the other day. It ran hot and started backfiring while I was trying to make it home. After I let it sit long enough for it to cool, I figured out that ...
Joshua's user avatar
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Testing valve grind job that previously leaked

I had a leaky intake valve so I took that cylinder head off to grind it. Before grinding, I tested that it was indeed leaking and that the other two cylinders in the head did not by setting it on ...
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Carbonized combustion chambers

I just took one of my cylinder heads off to fix a leaky valve(s) and the combustion chambers look very carbonized. I hope this is not from oil getting into the chambers. Present: 6 years ago, when I ...
amphibient's user avatar
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3 votes
1 answer
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Effects of intake valves leaking

I just measured cylinder leakdown rates on my 2007 Tacoma V6. 5 out of the 6 cylinders had retention rates of 75-85% (leaking 15-25%) but my cylinder 4 (left engine bank in the middle) was leaking ...
amphibient's user avatar
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3 votes
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Can one detect coolant leak due to blown head gasked by visual inspection of pistons/spark plugs?

I have problems with my 2004 Honda Civic. My engine overheats and there is no hot air coming to the cabin, even if the temperature gauge shows Hot. Every mechanic I know told me that it is a clear ...
CuriousPaul's user avatar
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1k views

Why would an engine leak oil only at high speed?

Small 90s econobox, 4 cylinder. ~300k miles. Stickshift, so engine speed is always proportional to road speed at relevant freeway speeds. Crossing the country recently, I observed extremely high oil ...
Harper - Reinstate Monica's user avatar
1 vote
2 answers
1k views

Lots of smoke after brand new head and head gasket install?

Just installed brand new head and head gasket in my 2001 Honda Civic SOHC. The block was machined and new head bolts were used. I started it up ran for a short couple minutes and shut it off due to ...
Jess Darling's user avatar
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Cylinder head and block replacemnt

Wonder if you could help. I have a 1988 fiat ducato highwayman. My motorhome was taken into an expert engine services garage. The original problem was cylinder head gasket. The garage removed the head ...
Flicker 's user avatar
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Head bolts over torque now what?

Doing a head gasket job on a Civic D16Y7 bought a brand new torque wrench (from the hft) turns out the torque wrench was/is faulty (won't even click clamped to a vice) over torqued a couple head bolts ...
David Scheiber's user avatar
1 vote
1 answer
355 views

Head Gasket issue , Coolant burning/mixing in the piston, white mayonnaise substance

I had all the symptoms of a head gasket issue in my Vauxhall Corsa 1.4 ltr (2012) A14XER Engine. Mayonnaise like white/light brown sludge everywhere. Rocker cover, Oil Dipstick, Oil Filler Cap. ...
ShanjayG's user avatar
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2 votes
2 answers
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Replaced Head on Propane Engine; Now I have too high compression. Why?

I hade a misfire in my propane burnisher (buffer). The Exhaust valve is stuck and wont move, as a result the push rods bent. Manufacturer recommended I get a new head. I replaced the head according to ...
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2 answers
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Head repairs on one side only

My church is looking to buy a used high milage van from a dedicated lease company. Good reputation. I have education but little hands on and the church uses my input for van preinspection. I'm not ...
Jupiter's user avatar
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Should you use gasoline on cylinder head gasket

I'm an amateur mechanic. Recently I met an experienced car mechanic and he told me that if I dip a new out of the box cylinder head in gasoline mixed with engine oil for a couple of hours, it would ...
PBlague's user avatar
1 vote
1 answer
697 views

Coolant leaking rear of engine/bellhousing area. Head gasket leak?

I have a 1998 GMC Savana with a 5.7L v8. I was losing coolant so I went underneath and saw little droplets near the oil pan. I would park the car for a week and come back and all the coolant would be ...
commandercorn's user avatar
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2k views

Hot Tank Solution for Aluminium?

My aluminium cylinder head is caked with oil and carbon. I’m going to be cleaning that along with other steel/iron parts. I’m planning to make a DIY hot tank to boil the parts in but what can put in ...
Junaid's user avatar
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1 answer
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I've got oil in the coolant, but no coolant in the oil - Renault Twingo RS

I just checked the fluids of my Twingo RS and made de discovery that there is oil in the coolant. So naturally i thought headgasket. But there is no coolant in the oil, no smoke out of the exhaust, no ...
Jeffrey's user avatar
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Do cylinder heads on boxer engines wear out evenly?

I know inline engines wear out unevenly on the cylinder heads with one usually egging out more but I don’t know whether or not boxer engines do and I was curious.
Geo metro's user avatar
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2 answers
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Does lapping valves ensure the seal of the valves?

I am building a 450-500 hp honda civic with a d16y8 head, i purchased brand new valves , and i was wondering how do I get these valves to seat and seal the chamber for combustion? Is lapping the ...
RonRon Scores's user avatar
0 votes
1 answer
22 views

97 Subaru overtemp

I picked up a 97 Subaru Outback at a very low price. I knew the head gaskets were bad and for the price I thought it would be a fun project. I am planning to replace the engine but thought it might be ...
Mark's user avatar
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2 answers
219 views

Feasibility of replacement of Subaru Outback 2007 3.0L Cylinder heads

As noted I have a 2007 Subaru Outback with a V6 3.0L engine. It appears to be front-wheel drive. The head gasket(s) need replaced and possibly the cylinder heads. I used to work on cars 25-30 ...
Oliver Williams's user avatar
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1 answer
284 views

Can push starting a motorcycle cause damage to the piston rings?

About a month ago I noticed white smoke coming out of my motorcycle exhaust. Not constantly, but it would maybe start smoking and then stop after riding a little. Or maybe keep smoking even after ...
IanC's user avatar
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1 answer
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Head bolt replacement on a Mustang gt 2005

I had the engine on the car rebuilt and when the shop tried to start the car they found out that they had to use new phaser bolts. In less than 10,000 kilometers the engine is overheating and I ...
Wayne Stevens's user avatar
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1 answer
115 views

Which is the Toyota specific toolset name in order to change head gasket on a ᴠᴠᴛ‑i engine?

My mechanic told me reassembling the cylinder‑head for a ᴠᴠᴛ‑i engine requires specific Toyota tools. His car part provider isn’t selling them, and as he is unable to use a computer or a mobile phone ...
user2284570's user avatar
2 votes
2 answers
777 views

Can I determine if a blown head gasket has caused significant engine damage before removing the heads?

I know i have a bad head gasket, but i didn't know until the car utterly lost power one day driving it until it stalled on me. it all happened in like 10 seconds - i was going up a hill, and realized ...
tntwyckoff's user avatar
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1 answer
4k views

Properly diagnose coolant leak after head gasket repair?

I bought a BMW E46 330Ci (M54 3.0L Engine) that was not properly maintained. It was leaking coolant and sputtering white smoke and water from the engine (didn't sound smooth). Coolant pipes were also ...
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1 vote
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Physically broken camshaft position sensor

The check engine light on my 2006 Toyota Tacoma V6 went on and, when I did OBDII disagnostics, it turned out I had P0348: Camshaft Position Sensor A. I took the sensor out and it turned to be ...
amphibient's user avatar
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0 votes
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Blown Head gasket for triton

My 2005 tritons overflow is bubbling every time I go to point A to B and sometimes coolant pours down to the floor I know that it’s a sign of a blown head gasket or an cracked head.. is it still safe ...
Philip 's user avatar
1 vote
0 answers
59 views

93 Honda Civic LX - fluctuating revs, poor running

My Civic has done ~246,000 miles and is now running very poorly. While driving down Interstate Car bogs down stalls out and there's smoke from front and back. Spark plugs are fouled out and when ...
Boss cookie's user avatar
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0 answers
50 views

Quick fix? Or major problem? Please help

Help, 02 honda civic lx coupe cranks but will not start. I bought the car less then 3 months ago put used rebuild trans in it seemd fine then what seemed to be running hot but with no warning signs so ...
A.dillon's user avatar