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Blown head gasket in 3 min. a new record!

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J

Jerry

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I just started my TR4 engine (87mm pistons). I put it on an engine test stand. Started right up after I sealed the leak in the fuel pump. But the carburetors were having problems and while I was fixing that, I noticed the radiator overflow started to blow fluid. Number 3&4 cylinder were leaking into the water jacket. I had put on a COMETIC head gasket, made for the car (87-89mm). This gasket is about 20 thousands thinner than the copper usual. It also had a round cylinder ring vs the copper has one that follows the head shape. I could see impressions from the exhaust valves (scorch marks in the gasket and one place where it was leaking from the water jacket. Looks like air out to the water jacket, not water into the cylinder. There was NO white smoke, but lots of pressure in the radiator. The cylinders have set down into the block, not lower but not much protrusion. No water into the oil that I can see. I was looking for your opinions on trying the copper gasket back on the engine without tearing down the sleeves to check the figure of eight gaskets? Jerry TR3 with TR4 engine.
 
I thought Cometic was .043", about 10 thou thicker than stock. Which one did you get? I have a .043 waiting in the wings so I am interested in the outcome. Check the liner protrusion on 3 sides as Randall recommends.
 
Hi Jerry
Horrible news. Let me know if you'd like some consolation. Can stop over with a six pack of some fine ale and the bubbles in your radiator won't seem so awful, after a while!
Pat
 
Check the liner protrusion on both sides. If not within the range given in the manual, and reasonably close together, then there is no way a standard gasket is going to seal for long, IMO.

However, this trick has worked for me for quite a few years now, on two different engines. Basically just a ring of .020" half-hard copper wire around each cylinder, next to the fold in the gasket. I used "electronic" solder, but I've heard that super glue works as well.


 
I measured the Cometic gasket after it failed so I don't know how thick it was to start with. But I just put a copper gasket on and I could tell by the rocker arm adjustments that the copper is thicker. A little more adjusting tomorrow and I test the new gasket. I will let you guys know what happened.

Jerry
 
I put the copper head gasket on and it is running well now. I did find the themostat was not opening as it should. I may try another brand.
I need one BSP female fitting to a 5/16 barb. Anyone know where to buy it?
 
I've got a 3A with 87mm pistons etc and I use a cheap Chinese CA gasket and copper FO8 liner seals and have never had any problems with either. There must be something wrong that needs sorting properly.

I'd look for cracks in the head, in the block face around the studs, especially around the one over the water pump and the two end ones on the distributor side. Then I'd check liner height and if in doubt, knock them out and start again with copper FO8s and Loctite 5699 gasket sealant around them.

These are not engines that have head gasket problems if they are correctly assembled.
 
EV2239 said:
I've got a 3A with 87mm pistons etc and I use a cheap Chinese CA gasket and copper FO8 liner seals and have never had any problems with either. There must be something wrong that needs sorting properly.
Click to expand...

Does anyone know who sells copper figure 8 gaskets? I have the steel ones from the Payden kit. Do copper seal better or are both styles fine?

Thanks for the helpful thread, guys.

pat
 
PatGalvin said:
Do copper seal better or are both styles fine?
Click to expand...
I've used both kinds, never had any trouble with either. I believe the steel ones are supposed to have a plastic/latex coating on them that helps them seal, but I add Permatex anyway.

I did fight head gasket problems for a lot of years, but it turned out to be that the block was not machined properly at the factory. The right solution would have been to have the block decked to the right height (above the liner seats), but the copper wire trick has worked great ever since I realized what the issue was.

Likely it's just coincidence that two (early) blocks in a row were mis-machined; but I have to think it was a fairly common problem. First one was TS11xxx, second was TS15xxx.
 
Dont go into shock but VB sells a kit with the copper 8 seals.If you replace liners and fail to have the
block checked for the correct height of the sleeves you run a real risk of trouble.The liners should be
dead flush BEFORE the 8 seals are installed,they provide the proper crush for the head gasket....
MD(mad dog)
 
MDCanaday said:
The liners should be dead flush BEFORE the 8 seals are installed,
Click to expand...

Is that your final answer? Are you really trying to claim that the Fig 8 seals are only .005" thick?
 
Hey Randall

Do you have an opinion of how to measure the sleeve distance above the block deck? Do you seat liners and just tap down with rubber mallet? Or torque down head and then remove and measure distance sleeves sit above block deck? Basically, how much pressure to apply to sleeves to seat them in block prior to measurement?
 
I tried both methods and didn't see much difference. At least for me, it doesn't seem that the Fig 8 gaskets permanently deform and the liners should move easily in the block. So now I just tap them down and measure. If they were too high the first time, I might try torquing the head down (without a head gasket), but that hasn't happened yet.
 
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