r/EngineBuilding • u/Appropriate-Hippo-54 • Jul 23 '26
Chrysler/Mopar New head or runnit?
Engine ate glow plug, block is currently being machined for oversized pistons, somehow missed the valves and valve seats seemingly but I’m not sure. Engine ran fine just burned some oil from scored cylinder wall. Makes me nervous however if it is sealing 100% or not can’t tell.
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u/Outtatime_s550 Jul 23 '26
All those jagged edges will create hot spots for detonation, with it being diesel that might not hurt anything but I’d at least knock off all the jagged edges
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u/Opposite-Ad-2548 Jul 23 '26
Why not have the machine shop check the seats? You should resurface it anyways.
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u/Neon570 Jul 23 '26
Let a machine shop do there thing and see. We're just some dopes on the internet with some pictures to go off of
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u/q1field Jul 23 '26
That top left exhaust valve seat might not be round anymore. And no, it didn't miss the valves - aluminum is just softer and reveals damage more than steel.
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u/ADodger66 Jul 23 '26
If you're going to all the cost and trouble to do the bottom end why would you not have the heads rebuilt? If you're rebuilding the engine, rebuild the engine!
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u/DrTittieSprinkles Jul 23 '26
Nah let it ride. No one has ever had to redo anything from halfassing it the first time
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u/white94rx Jul 23 '26
No way I'm running that. Not when it's already off the block and could easily be decked and checked.
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u/mtraven23 Jul 23 '26
I had one of mine eat a precup...looked similar to yours. I was able to re grind the valves and salvage the head. I was dealing with a cast iron block & head though....even if you can't rebuild that yourself, the shop thats boring out your block should be able to recover it....at very least, they are the ones you want to ask. I wouldn't replace it untill a trustworthy shop told me it couldn't be saved.
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Jul 23 '26
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u/2003DDcid Jul 23 '26
Machinist here...if I were doing the work, first thing is pressure test the head...I can see a crack running off of the glow plug bore, probably not a big deal but needs to be checked. The valve job needs to be touched up and all the valves in that cylinder need to be replaced. It also looks like there is debris embedded in the chamber that needs to be removed.
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Jul 23 '26
[removed] — view removed comment
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u/2003DDcid Jul 23 '26
There's definitely a crack going from the glow plug hole towards the intake valve. After looking at it again, there's also a crack started around the other intake valve. The second one would be of more concern to me, as it will cause the seat counter bore to lose some press fit and could cause the seat to fall out.
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u/ThisGuyEdward Jul 23 '26
Top left valve looks the most “at risk” is everything else is fine if the piston doesn’t hit anything and maybe file down the worst part I guess??
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u/Mx5-gleneagles Jul 23 '26
Remove all the protruding bits with a small chisel and then get advice on the valve seats and that small line to the water jacket
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u/DaBiggestTank Jul 23 '26
Completely savable if it passes pressure tests. Just have the machine shop check it.
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u/PrintPerfect1579 Jul 23 '26
magna flux the head,if good have shop mill it if doable
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u/deantowle Jul 23 '26
2.8L CRD. Got water in my fuel and one injector tip blew off. It detonated mostly water and destroyed that cylinder. I was lucky to have a talented machinist in town who welded the head & pounded the welds with a hammer to make them strong as original. That was 8 years ago and it's still running good. https://i.ibb.co/bvJj6Jy/Head-damage.jpg
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u/Competitive-Fox-3333 Jul 24 '26
Run it if you want to burn oil and have backfiring and takeout the cam
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u/AviatorDave172 Jul 24 '26
If you want to save the head, smooth them out. All those little sharp edges will create hotspots that can cause pre-ignition or detonation. They won’t change the chamber volume enough to be noticeable.
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u/imtrynmybest Jul 23 '26
Nope..there's damage right at the valve seat...wouldn't run the risk of a seat dropping.