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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 09-13-2005, 11:55 PM   #1 (permalink)
manyholes
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f-series and l-56/l-65 q's

Just wondering if you can tell the series of an engine by the vin and also if its an L56 or L65 engine too?
what is the deal about f series engines? and which block is better? thanks fer help, tis a diesel newbie

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Old 09-14-2005, 12:55 AM   #2 (permalink)
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The f engine is the L65, it is the one without the EGR. The main engines to watch are the 97-98 and some 99 506 castings. They had problems with main web cracks. The 8th digit of the vin is the engine code. The early 6.5's had inadequate cooling systems but that is easily remidied with the 97+ cooling mods. Check out the FAQ's section, you'll have reading material for hours.

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Old 09-14-2005, 01:31 AM   #3 (permalink)
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main web cracks?

Thanx fer the 411, ive been reading the faqs but didnt see where it said you could id the different engines, what do you mean about main web cracks? are you refering to crank mains? are all 97's 506 castings? how can i tell what the casting is?Location? thanks very much
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Old 09-14-2005, 12:56 PM   #4 (permalink)
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The 506 blocks had the 5/8" oil cooler lines the older ones had 1/2". The casting number is on tha left rear of the block behind the cylinder head. I'm not certain what the breakdown on the numbers is but if it is a 97-98 506 it has the cracking the ones maid in 99 and later were revised. The main web cracks is the main bearing area for the crank. The later 506's are ok and the latest 506's made by international are the better blocks. I'm not certain if GM is selling leftovers or the new international blocks now. I've seen some leftover engines for sale but nobody would tell me if they had the diamond on the block or not. The diamond is the international logo, if you see that then you have the latest casting. But you would see that only on replacement engines.
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