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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1answer
100 views

Engine overheating

I need some advice, I bought a 52 Corsa 1.0 about 2 weeks ago as our other car failed the mot badly and wasn't worth repairing. It's overheating rapidly (5-10 mins of driving) it looses pretty much ...
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Fiat Uno 1.0 cylinder head valves

I would like to know how to remove the valves from the cylinder head.
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1answer
3k views

Checking engine head for flatness: what clearance generally, in mm?

This engine's (Skoda Estelle/120, 70s, RWD, rear mounted engine) head is cast iron, the block is aluminium and I'm checking it's flatness. What would be the correct flatness clearance range? I have ...
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1answer
1k views

Piston deck clearance: is 1.4 mm under deck too much?

I'm installing a piston set in a Skoda Estelle 120 engine. I know this is not a definite way to measure piston to deck clearance, but it jumped to my mind to measure it with a vernier caliper using ...
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1answer
2k views

Removing head while maintaining timing chain tension & position

I'm pulling the head off of the Solstice (2006, 2.4L Ecotec LE5), and would prefer not to have to remove the timing chain cover to get the timing set correctly. The last time I did this, the engine ...
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3answers
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Washers under head bolts: Should I use them under stud nuts?

In the parts manual for the engine I'm rebuilding (Skoda Estelle/120, RWD, rear mounted engine) I see they list washers for all the head bolts. I have changed the way to secure the head against the ...
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1answer
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This valve is pitted - what options do I have?

This is that infamous Exhaust Valve #3 after cleanup. The cylinder had a history of fuel/spark-related misfires. As the images show, the lip of the valve is pitted. Here is the back of the valve. I ...
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1answer
886 views

Is this cylinder head junk?

There's a chunk of aluminum missing from the surface of my LS1 cylinder head. In the picture below it is located on the edge of the rusty looking cooling jacket port. Is this something to be ...
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1answer
97 views

Stripped out head for rocker arm bolt

I have a rocker arm in my '03 Century Custom that has stripped out the head. I tried to tap it and helicoil it but unfortunately the tap went sideways. I am thinking that I may be able to drill and ...
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1answer
3k views

Head bolt sequence for 4.3 liter 1995 Chevy 1500

What is the head bolt sequence for a 1995 Chevy truck 4.3 liter engine?
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1answer
55 views

Head studs' threads larger length: problematic issue?

As I'm getting ready to (finally!) re-assemble this old engine (Skoda Estelle/120 '70s, RWD, rear mounted engine), I needed/wanted to change a few studs, but basically all of the head studs are ...
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2answers
525 views

Can you run an engine with an acorn shell in one of the cylinders?

While I was taking apart a 2003 3.8L Ford Mustang that I recently bought, one of the many small acorn shells I found on the engine fell into a cylinder through the intake port (red arrow in the photo)....
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Timing related on 2000 Ford Excursion 6.8 Liter V10

Kind of a lengthy question. I had to pull the cylinder heads in order to repair exhaust manifold bolts that were broken. Unfortunately, I was not able to do it from the wheel wells. Before starting ...
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1answer
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Spark plug thread broke inside the engine [duplicate]

I took out the spark plug on the fourth cylinder and it appeared to have some metal on its thread I cleaned it out and put it back inside while tightening it the thread broke inside The part in ...
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2answers
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Bubbles coming out of the radiator. Head gasket?

I was bleeding air from my Honda Civic yesterday. Everything was going well until the coolant was still bubbling after 40 minutes of bleeding. I did everything correctly. Turned the heater to max, I ...
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3answers
651 views

Should I get 2nd Opinion on head gasket issue?

My daughter's car had a check engine light on and was overheating. We had it towed to a mechanic and he did the block test with the vapors. The mechanic said the blue stuff turned yellow immediately ...
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2answers
1k views

Can leaky cylinder explain oil loss to burning?

One out of the 6 of my Toyota Tacoma cylinders is mildly leaking, as indicated by a cylinder leakdown test. While other cylinders are leaking only something like 5-10%, this one leaks about 20% of the ...
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Is engine start failure reason for dealership mechanics to check fluid levels? [closed]

My daughter's car was towed to the nearest Toyota dealer because it stalled. All lights came on in dash and it smelled burned. We were given a clean bill of health the next day just to have it towed ...
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2answers
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Need Advice On Designing New Cylinder Head

I am an engineering student. And we have an assignments to test our abilities on working on something new that you never worked on, to help with problem solving and to allow us to tackle any problem. ...
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4answers
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Why don't cars have a cylinder head with separate barrels?

Most if not all cylinder heads are one big block. Why don't some car manufacturer use a single cylinder head for each cylinder? What are some of the biggest drawbacks of this type of method? This can ...
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4answers
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Do Most Common Engines Have A Cylinder Head?

I know there are different types if engines. All with different set-ups and designs. But do most engines have a cylinder head? And how many? I know inline engines have one, V-lines have two and radial ...
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2answers
154 views

Where do you install cylinder heads, camshafts and valves in different engine types?

I am trying to learn about engines, so my question is where do valves, camshaft etc go inside different engines? I see different engine have them in different places, base on if the engine is a inline,...
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1answer
540 views

Can I use hard tools to remove hardened carbon buildup on valves?

I used a brass brush by hand to clean the carbon off the aluminium head of my BMW R80GS 1991. The valves however are very stubborn, a brass dremel head won't do it either. I started using a soft steel ...
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Using a thicker head gasket when the cylinder head resurface limit is reached

I just bought a 2000 Civic 1.6L ( d16y8 ) with no compression in one cylinder. Four years ago, the engine overheated, and was completely rebuilt by the Honda dealership. One of the things on the ...
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1answer
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Small crack/gap between cylinders on block

I was doing a head gasket replacement onnmy 86 Kawasaki ninja gpz1000 and I while cleaning the gunk off the top of the block I noticed a small gap/crack in between two cylinders (Pictures are linked ...
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1answer
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Hand turned the crankshaft while in gear. Clutch damage?

My timing belt broke on a 2008 Hyundai Accent and due to being broke I decided to try and fix it myself. I managed to get everything off, two slightly bent valves on the head which I took to a shop ...
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2answers
702 views

Peugeot 406 1.8 engine, oil comes to radiator

In my Peugeot 406, manufacture year 2001, engine 1.8, very recently I had overheating issue due to thermostat valve block. I have replace thermostat valve and now I can see engine oil mix with ...
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How can head port volume affect the power curve of an engine?

Recently I learned that even more things other than the ones already mentioned here can effect the power curve that is produced by the engine. Here is an example of one. I understand that there are ...
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3answers
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What is a head?

Due to this question I now have a fairly well-rounded understanding of what a head gasket is. I assumed that sometimes, when people would talk about "heads" that this was just an abbreviation of ...
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1answer
89 views

Replaced a ton of parts - grey/white/black exhaust smoke and funny noise persist

I've replaced my Corsa Bakkie's cylinder head, changed plugs & oil, cleaned the petrol pump, replaced everything that I could. There is still a funny noise (like the sound when you put a card at ...
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2answers
1k views

how do I fix a cracked cylinder head

Cylinder head has broken in a line about four inches long on the underside of the part of the head that the valve cover bolts onto. Can the head still be rebuilt or is it junk?
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1answer
7k views

How much vehicle life is added by rebuilding cylinder heads?

Now that I have fully rebuild the cylinder heads (all engine gaskets + valve lapping + lash tuning) on my 2007 Tacoma with 124K mi, I am curious how much life I added to the vehicle, approximately. I ...
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1answer
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Symptoms of valve adjustment necessity

I have recently had to rearrange my valve lifters in order to tune to an optimal clearance between cams and lifters, which on my Tacoma is 0.15-0.25 mm for the intake and 0.29-0.39 mm for the exhaust ...
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Assembly lube or engine oil when reassembling cylinder heads

I have read differing opinions on what should be used to lubricate cylinder head parts, such as valves, lifters, camshafts and bearings when reassembling cylinder heads. Some prefer engine oil while ...
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5answers
12k views

Can I run on 7 cylinders if I shut the injector to that cylinder off?

I have a 2006 F150 5.4 Triton 3 valve. I've had a really bad issue, where a socket is stuck in my spark plug chamber and everything has failed to get it out. The option I'm left with now is ...
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2answers
8k views

Motor oil going into the radiator and reservoir- Chrysler 300

I got the motor heads modified (think thats what you call it), timing belt and water pump replaced in March 2014. The last few months I've been having problems with my car over heating. It turns out ...
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3answers
31k views

How to clean cylinder head and engine block contact surface before gasket change?

How should I clean my cylinder head and engine block contact surfaces before a head gasket change? There is residue paint from the old gasket on both the head and block side. Should I do it ...
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5answers
2k views

Why do manufacturers use different bolt types on cylinder heads?

Why do manufacturers use nonstandard bolt head types? Is it just to make it more difficult to the DIY-er to get away from visiting a dealership? It was already too much work to dig down to the ...
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1answer
3k views

Can machine resurfacing of cylinder heads cause valve malfunction?

I learned that warped (uneven) cylinder head surface that goes against the engine block can be remedied by taking to a machine shop to get it resurfaced, basically to make it flush all the way so that ...
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1answer
10k views

Cylinder Leak-down vs Compression Test

I understand that both cylinder leak down and compression tests are used to test for cylinder head, cracks, warps, and gasket leaks. I understand the difference between how each works: compression ...
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Last year my timing chain had broken

I have a 2003 Pontiac Sunfire A tooth broke on a sprocket and my timing chain broke. I was told I have a bent valve and would need a new cylinder head. It's has been sitting for exactly a year. ...

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