300tdi Head Gasket

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O2batsea

Well-known member
Don't forget the little crush washers for the injectors. Also a new glow plug wiring loom would not be a bad idea. Oh and the spillway copper washers.Maybe a new catch can. The bolt that holds it on can be troublesome so get one of those in case you gotta get brutal with the old one.
And get some good AWAB hose clamps at the marine supply
 
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cullenm

Member
Well we got the old head off. Found a bent pushrod...thats fun. I also put a kink into one of the rocker shaft springs, stupidly. Hopefully i don't have to order a new one of those.

some pics:
 

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Red90

Well-known member
So the head gasket was not blown? Was the rocker cover never pulled to investigate what was wrong? Look at the bore as well. Running with a valve closed usually washes the cylinder.
 
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cullenm

Member
You can see where the head gasket blew between 2 and 3. Meant to upload this pick earlier
 

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cullenm

Member
Another hiccup here is that on the old head one of the valves was missing the stem cap. Spent too much time looking for it on the ground of this garage.... guess it’s time to place another order for parts...
 
jymmiejamz

jymmiejamz

Founding Member
Callsign: KN4JHI
Red90 said:
So the head gasket was not blown?
Click to expand...

The head gasket was definitely blown. Cullen bought this knowing the head gasket was likely blown. It had previously been overheated and from a cold start if you revved up the engine you would immediately have excessive pressure in the cooling system.

While we haven't determined the root cause of the blown head gasket, my suspension is that it is related to the electric fan that has been installed in place of the viscous fan. I noticed there is a wire loose from what looks to be an aftermarket temp sensor in one of the hoses.
 
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Red90

Well-known member
jymmiejamz said:
The head gasket was definitely blown. Cullen bought this knowing the head gasket was likely blown. It had previously been overheated and from a cold start if you revved up the engine you would immediately have excessive pressure in the cooling system.

While we haven't determined the root cause of the blown head gasket, my suspension is that it is related to the electric fan that has been installed in place of the viscous fan. I noticed there is a wire loose from what looks to be an aftermarket temp sensor in one of the hoses.
Click to expand...

But nobody noticed it was down a cylinder? Bending a pushrod is a whole different issue and you want to know why that happened. If it ran that way for any period of time, the bore will be screwed.
 
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cullenm

Member
got it all put together today and started it up. there was a terrible noise as if the valves were all poorly adjusted. Jimmy did some digging online and we swapped out the vacuum pump. Sounds great now. I’ll post videos of the before and after once I figure out how to upload videos. Special shout-out to Zach for getting the new pushrod sent out so quickly.
 
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cullenm

Member
Bumping this thread. Unfortunately this project has just been sitting dormant since we got the truck running. Didnt make sense to bring the thing up to nyc and so ive just driven it a couple times when visiting home for a week here and there. I'm curious if anyone here is interested in taking it off my hands now that we've got the new head swapped on. Its sitting at jimmy's shop down outside of richmond va. Id like to get what i have in it so ~$5k. if youre interested lmk and if i need to make a posting in the classifieds ill do that too.
 
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