What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

1989 Diesel Jimmy. What do we have here hmmmm

Overview Gallery Discussion
Shoot the timing chain is outa my budget let alone the gear set. This harmonic balancer doesn't look awesome either.

:doah:

We might be one rig down for longer than I thought
 
Do you have access to a valve spring compressor? If you do, I'd pull those couple valves and give the both the valve and the seats a good cleaning. Could get away with using a fine or semi course scotchbrite pad. Might help, certainly won't hurt anything. Won't cost anything but your time. Can just leave them be too.
You could also add a shim or two to the valves that leaked. Just don't go crazy with too much. .010 to .015 would be the absolute most I would use.

The slack in the chain is in the middle of the range for acceptable stretch. I'd put a new one in for cheap insurance. Lot easier to do it now.

If your questionin the balancer, changed it. I had one that looked OK but was 10 years old, it broke the crank.
 
Just checked and 1/2 inch is the point where GM says to change the timing chain. That would all one side, so if you are at 1/4" you're within specs.
 
Google and download "TM 9-2815-237-34"

That is the US military manual for these engines, and there are pdf copies floating on the interwebs. It will help you immensely.

On page 2-28 of that manual, the chain slop spec is called out as .810"

If you have trouble finding it, I can email it to you. Mods - any way CK5 could host the file? It's not copyrighted.
 
I downloaded it earlier Keith.

But unfortunately the only computer in the house is being monopolized by my wife. With good reason but still. It's a pain to read on my phone.
 
Bottom end pic.

BTW I cleaned some already here.



This engine does not strike me as a high mileage motor. It's fairly clean on the inside. The outside suffered from leaky gaskets. So who knows. The heads have been off before though as there were fel pro head gaskets on it
 
I would point out one thing though. With as deep as the oil pan is they really should have added 2" of block to the bottom. Just adding that probably would have prevented alot of block cracking. Stabilized the mains some too.

It pains me to really see with a couple minor changes this could have been a well regarded motor.
 
That's Chevrolet's fault.

That is also why it is not a Detroit Diesel.

When I worked for Detroit, I did a lot of factory training. The teacher was a retired Detroit Diesel engineer. I asked him about it one time. He said he was working there when they built them. He said if Chevrolet had made so many demands to cheapen up the engine, it would have actually been a good engine.

He is also the one who told me the 1982's were painted red, because Detroit wanted nothing to do with them.

Martin
 
82355 said:
That's Chevrolet's fault.

That is also why it is not a Detroit Diesel.

When I worked for Detroit, I did a lot of factory training. The teacher was a retired Detroit Diesel engineer. I asked him about it one time. He said he was working there when they built them. He said if Chevrolet had made so many demands to cheapen up the engine, it would have actually been a good engine.

He is also the one who told me the 1982's were painted red, because Detroit wanted nothing to do with them.

Martin
Click to expand...
That is how it goes...
Considering the state of ALL GM engines in the early/mid 1980's, I don't consider the 6.2 bad at all. I'd rather have one of these and address a few key maintenance issues vice any smogged out 305/350/454 with a Rochester...my first square body was an '86 C10 with a 305. What a complete turd.
 
I would be curious to see how closely the AMG P400 resembles Detroit's original design for the 6.2 - stud girdle as a deep skirt substitute, forged rotating assembly, thicker deck and head surfaces, etc.

And like @longbedder, I sure do like my turd of a diesel.

David
 
Throw me in third for that sentiment.

This may not be an industrial-strength engine, but it does very nicely compared to 1982's other automotive engine options.

And to GM's credit, regardless of whatever cheapness they introduced into the design, these engines hold up well in their intended application. As much as we might love how robust and bullet-proof 6BT engines are, they are serious overkill for a Dodge 3/4-ton (and commonly outlast the trucks). GM did a much better job matching this engine to their chassis.
 
Well it seems this engine is descended from the 8.2 fuel miser series. They are very few who like those. Seems it also lacks a deep skirt block design.

No matter though

Anyhoo my chain measured in the middle has .790" of stretch. As much as it pains me I need to replace it I think.

I also am going to replace the balancer. It is questionable. I have questions about my other one too.

So I will have plenty of time to finish cleaning and inspecting everything else. Gotta wait a couple weeks to order stuff
 
blazinzuk said:
Well it seems this engine is descended from the 8.2 fuel miser series. They are very few who like those. Seems it also lacks a deep skirt block design.

No matter though

Anyhoo my chain measured in the middle has .790" of stretch. As much as it pains me I need to replace it I think.

I also am going to replace the balancer. It is questionable. I have questions about my other one too.

So I will have plenty of time to finish cleaning and inspecting everything else. Gotta wait a couple weeks to order stuff
Click to expand...


Man, when I read the thread title ("Crackalackin"), I first thought you had the engine running (and producing a crackling sound). Hopes dashed. :wink1:

:popcorn:
 
Look at the mains like suggested. What shape is on the prechamber cup just for fun?
 
KirsL said:
The new AMG blocks fix pretty much every issue these engines ever had with the block.
I'm a huge fan of these engines. I could of given up on mine several times and done a Cummins swap, but I like to be different.
Click to expand...
I had a low-mileage Cummins 6BT in my garage, along with a crossmember. I sold them.

I am, by popular consensus: cuckoo.
 
You must log in or register to reply here.

Latest Posts

Top Bottom