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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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 ...
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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/...
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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. ...
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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 ...
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2002 Ford Escape - What type of O-Ring can I use for the coolant bypass tube that plugs into the head?

his coolant bypass tube connects directly to both heads. https://www.oreillyauto.com/detail/c/murray-climate-control/murray-climate-control-coolant-flange/mry0/86161/v/a/5218/automotive-suv-2002-ford-...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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2 answers
113 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 ...
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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 ...
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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 ...
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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. ...
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2 answers
168 views

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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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118 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 ...
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165 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 ...
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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 ...
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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 ...
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2 votes
2 answers
444 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 ...
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1 answer
2k 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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493 views

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 ...
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0 votes
1 answer
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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 ...
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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 ...
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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 ...
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2 answers
181 views

Oil still in coolant 99 Accord

Took my car to a shop and I honestly don't think they are the best even though they seemed like they knew what they were talking about. Long story short they did a head gasket repair, replaced the ...
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2 votes
2 answers
2k views

Engine makes tapping/knocking noise all the time, won't rev correctly and has no power

I own a Rover 25 1.4l 16v 103hp (naturally aspirated petrol engine) from 2003. I've had some issues recently, and I don't know if they're related to each other, so I'll start from the beginning. ...
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1 answer
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Head bolt torque settings for Daewoo Matiz 800cc 2004/5

I'm looking for the Head bolt torque settings for Daewoo Matiz 800cc 2004/5. My research yielded 85--90 NSm from here, but it does not seem correct. Another site stated 65-70Nm. Any suggestions on ...
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2 answers
815 views

Why facing the head block?

I have recently came across a problem. One of the rocker fingers (the one that touches the valve stems, and have cam rollers) on my diesel engine head has broken. This resulted in the pistons hitting ...
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2 votes
3 answers
3k views

How should I flush out a head gasket sealer?

I purchased a 2002 Ford Taurus, little knowing that it had a head gasket leak. After it was driven for a week or so it started overheating. I am assuming that the person that I bought it from put ...
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2 votes
2 answers
102 views

checking head gasket?

I have seen people turn on the heat inside the car before buying probably checking the head gasket or over heating of the engine? And some people press the coolant hose to check it. Can someone ...
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3 votes
2 answers
4k views

Can I use cylinder compression to conclude the valves are adjusted

Today a friend told me that my exhaust gas smelled funny and that I should check my valves. I don't find it very likely since the engine is around 6000kms old. Can I avoid the trouble by checking the ...
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1 answer
176 views

Toyota 4EFE Cylinder head

Why does the Toyota 4EFE engine have 3 Allen Heads in the middle of it? The Cylinder head will not remove from the block. Do these Allen Heads need to be removed to separate the cylinder head?
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2 votes
1 answer
2k views

On a V6 engine is it OK to replace one head and not the other?

Situation is the cylinder head of a Mitsubishi 3.0 liter V6 engine was damaged after sucking a washer into the intake manifold. Question: is it OK to just replace the one damaged head or do both ...
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2 answers
69 views

Ethanol or non-Ethanol?

Where I live gas is at $2.50 at 10% Ethanol at 87 octane and $2.90 for non-ethanol at 89 octane per gallon. I understand that smaller engines do not do well on ethanol. Is the loss of efficiency from ...
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2 votes
1 answer
1k views

What other problem than a blown head gasket can a failed C02 test indicate?

I had a very classic (or so I thought) case of blown head gasket in my car: Leaking a ton of coolant Bubbles in the coolant, when engine running Coolant seems to be brownish Failed CO2 Test on the ...
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1 vote
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57 views

Faulty cooling system but not overheating

I've got a Peugeot 2.0L HDI 2003 over the past several months I've had issues with the cooling system, it hasn't overheated until recently but has had other issues. It first started showing signs ...
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3 votes
2 answers
1k views

Is it possible to have a bad head gasket (or cracked head) without a loss of compression?

Vehicle/engine is a 1997 Jeep 4.0L inline-6 Cherokee Sport. I just got my oil sample analysis back from Blackstone Lab. Here it is. They say there's coolant in the oil, as indicated by the ...
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1 vote
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860 views

97 Honda civic white smoke coming out of the tailpipe

I am pretty sure it is a head gasket is there a quick fix for blown head gasket
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