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Time for a rebuild.Im at a cross road. need advice

My6.5

New Member
Messages
4
Likes
4
Location
california
Thread starter #1
Been a long time researcher but this is my first time posting here.

It looks like I'm going to need a rebuild. Not sure what is wrong but I'm thinking crankshaft.

I'm at a crossroads though. I can pay my guy around $3000 for a rebuild give or take. Or I was thinking I could get a donor truck (1997 gmc) with 95000 miles on it for $1500. The plus with the donor truck is it has new wheels and tires. Suspension parts I can use and also the newer double thermostat set up.

I just installed a new injector pump 3 months ago on mine before engine went out last week so I'm good there. I figure I get the donor truck put new injectors and glow plugs.

on one hand with the rebuild I know what I got.= peace of mind.
on the other hand I get an engine with pretty much low miles in diesel years , plus some bonus parts.= crapshoot on not having clear history of engine but lots of bonus parts.

What do you guys think?

fyi I have a 1996 z71 6.5 "s" code
 

WarWagon

Well it hits on 7 of 8...
Messages
8,522
Likes
3,138
Location
AZ
#4
Doesn't hurt to post up symptoms before assuming the worst. Broken flexplates or failed harmonic dampers make a lot of noise...

These engines are throwaway engines and consitered scrap in the engine rebuilder world. Mainly due to main web cracks. A used Optimizer is worth a rebuild because the blocks are better.

Doing it yourself anything goes. Some of us like to see how far they can go frugaly.
 

My6.5

New Member
Messages
4
Likes
4
Location
california
Thread starter #6
Doesn't hurt to post up symptoms before assuming the worst. Broken flexplates or failed harmonic dampers make a lot of noise...

These engines are throwaway engines and consitered scrap in the engine rebuilder world. Mainly due to main web cracks. A used Optimizer is worth a rebuild because the blocks are better.

Doing it yourself anything goes. Some of us like to see how far they can go frugaly.








Well truck ran fine no issues then at a stop light it got super loud. Step on the accelerator and super super loud. Like I threw a rod. It was so loud I decided on not limping it the rest of the way home. I noticed the oil pressure dropped some as well. I did notice a slight knocking sound the past few months but it would come and go. I thought about it being possibly harmonic balancer.

Fortunately the mechanic I deal with loves these 6.5 diesels. He hasn't seen it yet but we talked about options a few days ago. I wish I could wrench on it myself but I don't have the space or the time to rebuild it myself.

Thanks for the advice on the flexplate or harmonic balancer. I thought when balancer went out it automatically meant failed crank on these engines. I will look into that and keep my fingers crossed.


The donor truck is actually a truck that still gets used on occasion. I think the owner has one too many trucks and doesn't want it anymore. I could buy his truck and call it a day if I wanted. I just like my truck better.
 
Last edited:

Will L.

Well-Known Member
Messages
8,196
Likes
7,519
Location
Boulder City Nv
#8
Well tell him too sign up here and say hi too. This is a good home for 6.5 fans. Always nice to meet more people with the same addiction- haha.

I would say have him drop the pan and flywheel cover to see what’s going on, and make a decision from there.

As for the 97 for 1500- Thats a smokin deal if it runs good and is a half decent rig imo. Guessing from Cal it isn’t a rust bucket, most aren’t. Around here if it is a 2wd that would fetch $3k, another grand for 4wd- provided it looks ok and a/c works.

I would be tempted to buy it before the deal gets away, and if needed then use the engine. If yours turns out ok for simple fix then sell the other for a profit and pay for the repair of yours.

If you do rebuild yours or use the take out, I suggest pop in new bearings and gapless rings while it’s out. Depending on cash availability, there are other things to think about inside the engine - but it all hinges on cash being available.
 

Rodd

Recruit
Messages
1,250
Likes
220
Location
Antelope, CA
#9
Welcome! What part of Cali are you in? There are guy's up north and south here. Mine made a loud noise too but it ended up being the harmonic balancer. It did sound like a rod and vibrated like heck. It sheered off the key and tore up the keyway but with a little Jb weld to hold the new key in and red locktite on the bolt it's been going for about 20k miles now. It's an easy diagnosis. Turn on the truck and look at the HB. If it is the culprit it you will see it.
 

My6.5

New Member
Messages
4
Likes
4
Location
california
Thread starter #13
I didn't have time to do it today because of mothers day but Im going to check it out tomorrow. If it is in fact the harmonic balancer do you think there is a good chance that's the only repair? Or wishful thinking.
Good deal thanks
 

NVW

Well-Known Member
Messages
8,707
Likes
1,334
Location
Castor, AB.
#14
Without dropping the pan you won't know if the crank is the problem. Six bolts on the bell housing lower inspection cover and one or two on the brace rod will let you inspect the flexplate or flywheel, depending on auto or standard trans.
 
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