- 473
- 360
- 63
- Location
- California
On a similar subject of figuring out the engine condition, I read that you have a borescope (I have one a 6mm), besides going thru the glow plugs, are there other areas I should look at if my blow-by doesn’t improve?
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I think my head gasket failed
- Thread starter mgFray
- Start date
- 661
- 924
- 93
- Location
- Southern Minnesota
Doing it the 'right' way, install the studs then the head I don't think will work. I didn't take it apart, the shop did.. but looking at it I don't think there is enough clearance to pull the heads (with studs) while the engine is still in the vehicle.
Possible you could install the heads, then install studs.. but at that point, why not just use the TTY head bolts.
- 473
- 360
- 63
- Location
- California
I am so sorry to hear about your troubles, I have much smaller issues and it’s painful, I can only imagine your pain. On the positive side once it’s fixed you can enjoy the truck without worries, if it was going to fail, it’s better that it happened closer to your house than on some road trip.
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- 661
- 924
- 93
- Location
- Southern Minnesota
Absolutely, I'm very happy that it failed while pulling into my driveway. And the local shop was close enough I could drive it there without the engine overheating. I consider myself very lucky for that, as well as lack of (so far) damage found.
- 1,339
- 1,912
- 113
- Location
- Las Vegas Nevada
I don’t really know, other than maybe the exhaust ports. That’s a lot of work pulling stuff off. I think if you put a 1,000 miles on it and see where you are at. They said my truck had visible blow by and I changed the oil and drove it. I never seen any blow by but I think my truck had 187 miles on it. Rings probably not seated.
- 1,339
- 1,912
- 113
- Location
- Las Vegas Nevada
Well it makes me think that you would have more clamping force and a bolt that doesn’t stretch and you can reuse it. Hopefully I never have to do it but I would put studs whether I need them or not. I never like a 1 time use bolt.
- 473
- 360
- 63
- Location
- California
I saw your turbo, it was in great shape, very clean, no signs of oil. Yes, will take another look after 1k miles.
- 661
- 924
- 93
- Location
- Southern Minnesota
Machine shop called, valve seats have cracks in them. The guy at the machine shop said repair would be about $600 a head (both have cracks). (This is the 6.5L GEP.). He said he has repaired them in the past, but those vehicles were old and no longer in service. So he can't say how long the repair actually lasted.
Looking for the head part number (2815014112137) I see them listed between $1200 and $1600 new. So $600 seems like a deal, but am I setting myself up for a future failure?
Alternatively does anyone know of another option?
Looking for the head part number (2815014112137) I see them listed between $1200 and $1600 new. So $600 seems like a deal, but am I setting myself up for a future failure?
Alternatively does anyone know of another option?
SmartDrug
Well-known member
- 204
- 293
- 63
- Location
- Saint Charles, IL
No idea if this fits, but figured it was worth a look:
https://www.summitracing.com/parts/pmx-che855n
https://www.summitracing.com/parts/pmx-che855n
- 1,031
- 1,832
- 113
- Location
- WOBURN. MA.
Contact Promaxx and give them the NSN number and another number you have. They should be able to tell you if it work. Worth a shot.
Mark
Mark
- 661
- 924
- 93
- Location
- Southern Minnesota
That is exactly what I'm looking for. But I really need someone who understands compatibility. I know very little about these engines and the variations for the heads.
- 6,007
- 8,383
- 113
- Location
- Papalote, TX
Should fit the NA, the only 6.5L with special heads are the civi van/P series and the HMMWV turbo, those applications have a center mount turbo and different intake bolt angles, the civi turbo pickups had the same heads as the NA
I would assume by the price these are Chicom heads.
This of course does not mean they will not perform, they very well may be machined out of the same castings GEP heads use
- 661
- 924
- 93
- Location
- Southern Minnesota
I'm seeing on ProMAXX site:
CHE855N - https://promaxxperformance.com/product/gm-6-5-dsl-straight-new-full/
and
CHE856N - https://promaxxperformance.com/product/gm-6-5-dsl-angle-new-full/
The later says "DSL ANGLE NEW FULL" "mostly found on GM 6.5 Diesel Vans and Hummers."
- 6,007
- 8,383
- 113
- Location
- Papalote, TX
It should say found on GM 6.5L diesel vans and turbo hummers.
only GM vans and turbo Humvee/hummer use the center mount turbo which uses the angled manifold bolts
- 661
- 924
- 93
- Location
- Southern Minnesota
Great, so that means it is most likely the one pointed out by SmartDrug above. CHE855N. I sent an email to them and they asked for the casting number. I've got a call into my shop and they're trying to get the number so we can verify. But being in stock, that helps a ton and the price is in the right ball park at least.
- 6,007
- 8,383
- 113
- Location
- Papalote, TX
Same ones are on Flaebay with free shipping from Jegs, I think Summit has free shipping also over $200 IIRC
- 661
- 924
- 93
- Location
- Southern Minnesota
ProMAXX just got back to me and said to their knowledge all HMMWV are angled plugs which is CHE856N,
Edit: Jegs has the 856 in stock, Summit the 855.. So once I get the casting number, hopefully one or the other [or another vendor I've got a call out to] can help.
- 6,007
- 8,383
- 113
- Location
- Papalote, TX
That is interesting considering we are talking about the angle of the manifold bolts and diesels do not have "plugs" angled or otherwise.
The fact is "all HMMWVs" do not use the same head.
- 661
- 924
- 93
- Location
- Southern Minnesota
Ha, I completely missed the word 'plug' there. But I suspect that it's simply a typo, and they means bolts holes.