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All Other GM Diesels Discuss any other GM Diesel engines... 5.7l Olds, Chevette Diesel, or anything else that doesn't fit anywhere else...

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Old 04-19-2013, 01:51 PM   #1 (permalink)
heymccall
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is a 5.7 diesel, running good, worth anything?

My Caterpillar dealer technician has 5.7 extracted from a 1980 pickup, rebuilt 10 years ago, with approximately 10k miles on the rebuild. Hate to him toss it in for scrap. Is there even a market for it? How would he determine a fair price, to make it go away?

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Old 04-21-2013, 04:04 PM   #2 (permalink)
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They have a following. All the versions are getting pretty rare and hard to find parts for. The truck ones had 'pencil' injectors. Only the 78-mid 80 cars had the pencils. Just cuz they are rare now does not mean they have any special value. I see people asking a lot for them but the ones that sell don't tend to have any more value than a similar era gas engine.

There is a 5.7 forum. I can post the info there if you what to sell it. Who knows there may be someone in the area that thinks they need one.

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Old 04-21-2013, 04:25 PM   #3 (permalink)
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80 should at least be the better DX block, shouldn't it?
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Old 04-22-2013, 01:00 AM   #4 (permalink)
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If its an original it would not be a DX block. Not many D's made it past warranty so most of them were replaced with DX's. Biggest difference is the DX's had roller cams. D's were flat tappets. I think the lifter bore was different so it was not something you could just easily retrofit. Other changes were pretty minor and things you could easily fix when doing a rebuild. It was stuff like threading the main cap bolts deeper. They did beef them up in a few places but the deck and head bolt layout were still the weak points so you still could not really push it any harder and make use of a stronger bottom end.
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98 Burb K25 4.10's 250K miles, new to me, pretty clean and stock.
95 Burb K25 3.73's CRASHED 250K miles, looks to have been rebuilt at least once, stock, bad rust, DE exhaust w/walker muffler, 8' western plow.
81 Buick Riviera GAVE AWAY with the infamous Olds 5.7 diesel possibly still going strong.
15 VW Golf wagon, TDI. Did the buyback on my 13 Jetta TDI wagon so it was basically a trade up.
96 Burb K25 3.42's SOLD at 340K miles, told it was all original, close race between engine wearing out or body completely rust out.
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Old 04-24-2013, 09:48 PM   #5 (permalink)
Corts78
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They also drilled the head bolt holes deeper as well on the DX's. One of the issues of blown head gaskets on the D blocks was that as techs were torquing the head down, they would get their torque spec but what was actually happening was that the bolt was bottoming out and not clamping the head properly.

Unfortunately, these engines are so hard to find parts for and have such a bad name that they are really not worth much as a diesel. The DX blocks are very desirable to the Olds racing crowd as they can be used for high HP gas engines and have all the strength in the world.

The only parts that are really worth anything on those engines are the injectors and injection pump. Microjectors (poppet) are more desirable and are more common but there are still a few guys running pencil engines. Neither of these injectors are available anywhere.

SO my advice to your friend is tear that thing down, keep all the fuel injections system and sell it and scrap the rest, unless it's a DX block then scrap the top end and sell the block to someone who knows what it is.

Last edited by Corts78; 04-24-2013 at 09:59 PM.
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Old 05-11-2013, 03:18 PM   #6 (permalink)
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Rebuilt or not doesn't matter, what matters is whether it's had it's weak points dealt with - head studs, water separator, possibly better mains bolts, etc. I forget the exact list but the people that are fans worked up a list of things to do to make them reliable to correct failures in original engineering. A "standard rebuild" doesn't fix any of them. The fixes aren't expensive but some I think have to be done when it's tore apart to give it a good life.

They are rare but in low demand to most people because their reputation is horrible. A fair price is probably a little bit over scrap since unless you are in the circles where people are looking for/want the engine, you'll never sell it on the open market.


I'd buy it if it were local, and not much over scrap, and I had a place to put it - I want to put it into a project vehicle.

Last edited by midnightoil; 05-11-2013 at 03:19 PM.
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