Head Gasket done - no start

musthave

Desert Dune Offroad
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With all rod bearings and main bearings loose, crankshaft still won’t turn. The only thing left is the two or 3 inches past main number seven and the end of the bracket.

Interested in any opinions.
 
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I would measure the crank journals and polish them up and then if it is OK, then replace the bearings and run it.

It must have been assembled dry to fail that quickly.

#6 didn’t “spin” the bearing. That is when the Bearing spins in the rod and the crank really gets ground up.
 
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musthave

Desert Dune Offroad
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The vehicle was parked for about 45 days during HG rebuild. The bearings weren’t previously touched. Perhaps from sitting? Water could have been introduced during the original crank no start issue. Or through oil cooler.
 
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Wouldn’t the tabs be worn off on the bearing if they spun? That first picture of #5 I’m trying to decipher. Do you have an upper and lower bearing for that one or is that one melted into the other.
 

musthave

Desert Dune Offroad
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Wouldn’t the tabs be worn off on the bearing if they spun? That first picture of #5 I’m trying to decipher. Do you have an upper and lower bearing for that one or is that one melted into the other.
There is an upper and a lower, they separate fine.

So you started the "crank no start" session with fresh oil in the crankcase?
Yes, fresh build of everything. New oil, filter, fluid. Only oil. But after a few hours of crank no start, then it ran for 4 seconds. So, when it started, there was likely already a large amount of antifreeze in the oil.
 

ppc

M Go Blue
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When you originally replaced the head gasket how did you clean the tops of the pistons? Any chemicals used may have washed away any protective lubrication as all the cylinder walls look dry, scuffed with corrosion beyond what would have occurred after the engine locked up.
 
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It looks as if the PHH clamp caused interference between the block and head. You can see the indentation from it once you took the head off.
I’ve noted this interference when installing the head and how it did not seat perfectly flush. The PHH clamp needs to be installed with this in mind. This could have caused coolant to enter the system.
7F4DB7C0-9D2A-4A41-ADD8-C00DE4237F20.jpeg
91D3C4D4-62C4-4DFA-AB7F-F8999333C9E9.jpeg
 

musthave

Desert Dune Offroad
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When you originally replaced the head gasket how did you clean the tops of the pistons? Any chemicals used may have washed away any protective lubrication as all the cylinder walls look dry, scuffed with corrosion beyond what would have occurred after the engine locked up.
I cleaned the top of the pistons with simple green several times, then cleaned with brake cleaner, then wiped nicely. They all looked nice when I put the cylinder head back on.

Did you have any previous high temp issues?
No issues on the vehicle at all when I decided to do HG as PM.

It looks as if the PHH clamp caused interference between the block and head. You can see the indentation from it once you took the head off.
I’ve noted this interference when installing the head and how it did not seat perfectly flush. The PHH clamp needs to be installed with this in mind. This could have caused coolant to enter the system.
I hadn't noticed that, good find. That very well could have been the issue. It looks as if that clamp may have interfered with the correct seating of the head. Wow, this is interesting for sure. It would have caused a sizable gap there. Wow! Thinking...🤔
 
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Olathe, KS, USA
 
It looks as if the PHH clamp caused interference between the block and head. You can see the indentation from it once you took the head off.
I’ve noted this interference when installing the head and how it did not seat perfectly flush. The PHH clamp needs to be installed with this in mind. This could have caused coolant to enter the system.
View attachment 2316112View attachment 2316113
Good catch on that! That's the voice of experience!
 
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Good catch on that! That's the voice of experience!
I got into a habit years ago of using a small inspection mirror anytime I install precision parts. Especially where it's hard to see like the back of the 80 engine. I even use it for the valve cover gasket.
When I was lowering the head with the cherry picker, i noticed this interference. Made some adjustment and finished the job.
 
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Great observation. Definitely looks like the constant clamp indention on HG. Might just be from positioning and lowering head onto motor. It looks from pic that clamp is in the clear? I would think a rectangle imprint from clamp on HG would be present about an inch long if it didn't seat flush? Is the rear of the phh nipple flush with motor block when mounted?
 

flintknapper

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Deep East Texas
 
 
 
Great observation. Definitely looks like the constant clamp indention on HG. Might just be from positioning and lowering head onto motor. It looks from pic that clamp is in the clear? I would think a rectangle imprint from clamp on HG would be present about an inch long if it didn't seat flush? Is the rear of the phh nipple flush with motor block when mounted?
^^^^

Not really:

But the clamp doesn't need to be right up against the head, there is plenty of 'nipple' to engage....if it hasn't been shortened.

Head.jpg
 
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