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Tractor Talk Discussion Forum

350gas- to- 6.2 diesel

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Dave Sherburne

12-26-2006 14:34:33




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I've aquired a low mileage 6.2liter diesel. What am I going to run into when I try to replace a 350 gas in a 1985 GMC with a 4sp manual with this diesel. I know I will need a fan to replace the one with the bent blades on the diesel




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Mike M

12-27-2006 10:37:21




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
Well I'm glad all you guys are that lucky with those 6.2's you better go get some lotto tickets. LOL

Mine was a dud from day 1 what really turned me sour was when I pulled the rear main bearing cap to fix a leak real low miles on it too maybe 30-40,000 ? and saw it had UNDERSIZED bearings in it from the factory. I bought this thing NEW or at least I thought ? GM must of put used parts in it? Plus you got to pull all the injector line to fix a valve cover oil leaks which started at 12,000 miles. Ford/IHC had a way better design,but Cummins is the best so far.

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jdemaris

12-27-2006 06:50:25




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 Junk? in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
Let me know if you chose to believe Mike M about the 6.2s being junk - and decide to sell. I live nearby to Sherburne and I might buy the engine from you if the miles seem believeable. I looked at one in your area awhile back - but it was in a G30 ex-schoolbus and the engine had been changed once - so there was no history on it - just guesses - subsequently I passed on it. I come across many good-running 6.2s with actual miles unknown. Often heard is "it must have low miles because it runs so good." In reality, that means nothing. My 87 with 520,000 miles ran and sounded like a new engine. If well cared for, they usually run great until the block cracks and the crank breaks to pieces. I've been using 6.2s since new and never got less than 300K on one.

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Dave Sherburne NY

12-27-2006 10:09:26




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 ANOTHER QUESTION in reply to jdemaris, 12-27-2006 06:50:25  
Not for sale, just because one person has trouble doesn't mean all 6.2s are bad I got this engine out of a pickup truck, and it was running very well started real good too. I had a 72 chevy with a 350,
and it had a lot of power Since then I have had a few more with 350, and every one seems weaker than the one before This dog gets less than 10 miles per gallon downhill. My son has a 6.2 in his pickup and
has plenty of power, and over 20 mpg.
My only question on the swap now is will the flywheel from the 350 gas go on the 6.2 diesel????

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jdemaris

12-27-2006 14:43:32




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 More flywheel info in reply to Dave Sherburne NY, 12-27-2006 10:09:26  
I want to clarify what I said about no other flywheels fitting a 6.2 diesel. Actually, flywheels from several gas-engines will fit - but are still not correct - this includes small and big block chevy engines. I've got piles of OEM GM tech manuals but I've yet to find specific info on 6.2 diesel engine balancing. I don't know what year your 350 is - but a 1985 350 gas flywheel and clutch will physically fit the 6.2. As far as I can tell - the 6.2 diesel requires some external balancing via the flywheel mass - whereas most small and big block gas engines do not. The end-of-crank flange and bolt pattern though is the same for many gas and diesel engines that use the two-piece rear-main-seal. 6.2 diesels changed over to a one-piece around 1992. So - from anything I've read over the years - to be right you need a flywheel made for the 6.2 diesel and nothing else should be used even if it fits. The clutches from gas engines are not a problem, but the 6.2 is supposed to have a 12" clutch. Many gas engines use smaller clutches - which also might have something to do with the flywheel differences. GM #3991469 gas flywheel fits many SM and BB engines from 1955 - 1985 but will not take a 12" clutch. As I said earlier, there are lot of used OEM flywheels around. Also, places like Partsamerica sell new 6.2 diesel flywheels from Pioneer - # 502710. Oddly - Centerforce sells new racing-flywheels that are listed to fit 1969 small-block Chevys and also 1984 3/4 ton Chevy 6.2 diesel trucks. I have no idea what that is all about.

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jdemaris

12-27-2006 12:45:01




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 Re: ANOTHER QUESTION in reply to Dave Sherburne NY, 12-27-2006 10:09:26  
No, a 350 flywheel won't fit. 6.2 diesel manual flywheel is casting #14050525 or #14022675 - nothing else fits. There are many for sale used though junkyard searches in the $50 - $75 price-range. You can also buy them from Partsamerica - resurfaced - for around $120 outright - or $40 if you have a core to trade in.

5 PART# 16668 or #14022675



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Mike M

12-26-2006 19:41:32




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
I wouldn't waste the time,stay with the 350 gas ! or better yet go with the 454. I had a new 6.2 in 1983 and it was nothing but JUNK !!!! I now wish I'd of got rid of the whole truck sooner,but I did swap in a 1969 327 and it never ran better or more trouble free. I finally got rid of the truck. No more CHEVY'S for me !!! My 1996 Dodge has been far less trouble than any other truck before it.



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Mike (WA)

12-27-2006 08:24:39




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 Re: 350gas- to- 6.2 diesel in reply to Mike M, 12-26-2006 19:41:32  
I got rid of my '84 GMC van with "junk" 6.2 at about 300,000 miles (never had the head off)- I see it from time to time- over 400k now. If that suckers gonna be a junker, it better hurry, before it dies of old age.



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Bill Pa

12-27-2006 07:11:02




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 Re: 350gas- to- 6.2 diesel in reply to Mike M, 12-26-2006 19:41:32  

I have a brand new long block 6.5 diesel in the crate could somebody tell me what its worth?



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thejdman01

12-27-2006 16:25:42




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 Re: 350gas- to- 6.2 diesel in reply to Bill Pa, 12-27-2006 07:11:02  
2 dollars Ill be over with the truck tomorrow to pick it up. LOl. Depends waht the casting number is and hwen it was made, complete engine or just the long block??? I just recently had a horror story on the 6.5 turbo. Long story short. Driving bluew the heads, while i was in there put in heads head gaskets, glow plugs everythign to do it right. Started it up and low oil pressure and a heck of a noise. Sickening at only 150,000 miles. Dont know what to do w/my truck now. Got so much money tied up in the top end to junk out, cant seem to find a buyer for it as is. Bottom end is a real pain as its a 4x4 and cant jsut pull the pan and spin some bearings in IF the crank shaft was ok. Bought a new truck to replace it for now. The 6.2 was a great engine (havent had good luck w/6.5 nor known people w/good luck. Dads turck had 390,000 hard miles on it (pulling anhydrous wagons, grain wagons) with a 4.10 rear end and 3spd auto that made her scream. They were good trucks. had one w/289,000 miles was pretty good. Like i said not high horsepower (and dont try to make them with injectors and turbos etc) and hard to start relativly, but goo dowrk horses.

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jdemaris

12-26-2006 17:58:11




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
Sounds like maybe you got the 6.2 out of the school-bus G30 van I was looking at awhile ago? Supposed to have 80K miles? Any axle-ratio up to a 3.73 will work okay - just gets a little noisy at 65 MPH. If you've got 4.10 ratio - it's a stretch at 65 MPH - I've got two like that. A 3/4 truck with stock tires will turn 2750 RPM at 65 MPH, a 1/2 ton will turn 3000 RPM. I put 520,000 miles on my 6.2 Suburban with 3.73s, no overdrive, and lots of 65-70 MPH driving. Keep in mind though, that a 6.2 is at it's peak of efficiency at 1800 RPM - and pretty much stops gaining power past 2200 RPM. In regard to the change-over - as others told you - the engine-bolt-pattern is the same. There are plenty of 6.2 manual flywheels around - CASTING # 14050525 PART # 16668. If you have a vacuum booster for brakes - you've need to either change over to hydroboost - or add some sort of vacuum pump. Many 6.2s aleady have a small rear-mounted vacuum pump - but some applications use a belt-driven - like vans and some newer trucks. You'll probably also need the vacuum to run cruise-control and heater/defroster controls. You absolutely need a good 6.2 radiator, and also a good diesel fuel-filter and water-separator. The stock filter assembly GM uses from 1985 on has a built in fuel heater, water separator, etc. Also -glow-plug controller system needs to be right - or - install a manual push-button along with current-limiting glow-plugs - e.g. AC 60Gs (made by Beru), Wellman WAPs, etc. They won't blow if you hold them on too long. Your best bet might be a cheap rusted-out donor vehicle with all the little parts. I know where there are several - I've got over 30 6.2 diesel trucks/Suburbans/Blazers. They can often be found in central New York in the $50-$400 price ranges.
I bought a good running 86 Blazer 4WD with 6.2 diesel and 80K miles this morning for $200. I bought another last week with a bad trans. for $50.

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Jim J

12-26-2006 15:54:25




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
I have converted 2 Chevy's from 6.2 to 350 gas engines. You will need the brackets and pulleys off of the 6.2 & the throttle cable. The exhaust will bolt up. I don't what you will do for the glow plug controller. You will need the radiator for a 6.2. The 83 was a 3/4 ton with 4.10 gears and the 84 was a 1/2 ton with 3.73 gears. Your gearing should be fine.



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farmer boy 2

12-26-2006 15:53:22




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
I've always thought this was a possibility with trucks and have thought of doing the same thing with 1997 350 1500 and a 1991 6.2 Litre diesel. I would think that if you had a whole truck that was salvaged from being old and rusted or from being in n accident it wouldn't work to bad although you need alot of time to work at it. That's about the only way I would think it would work because so many of the parts are not interchangable. Also, you can run these engines with only one battery but when it gets cold it will get harder to start and you could dead the battery and have to boost it and possibly recharge it but if you live in the southern states you should be fine. The rads in these things look like they could fit in a 305 but like i said you would want to have a WHole salvaged truck or make sure that the parts are available at a reasonable price unless you want to spend alot of money on the project. The only reason I've ever thought of doing this was because the 6.2 has better gas mileage, more torque and is quite reliable.

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Tom43

12-26-2006 15:28:35




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
Dear Sir,
Sorry to be a grinch, but unless you are a highly skilled mechanic who loves challenges,frustation, and countless unforseen obstacles you would be better off to blow your nose and get it out of your head. If you want a puzzle go to a hobby store. It will be a lot cheaper.



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davpal

12-26-2006 20:18:33




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 Re: 350gas- to- 6.2 diesel in reply to Tom43, 12-26-2006 15:28:35  
I agree 100%. I can't see any benefit of this swap whatsoever. No matter how hard I try I can't see any reason to do it other than saying I did it. 350 chevy is one of the best running, most powerful,well balanced, easy to work on, powerful, universal motor on the planet. The 6.2 diesel is none of the above and should be left where it was lying. If you want fuel economy get a 250 6 cylinder and drop in there. Then it would start in the winter too!

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Bob

12-26-2006 15:07:55




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
Engine will bolt in. You will need a matching flywheel for the diesel. Exhaust is different, and won't match up. You need accessory mounts for the diesel. You need a second battery, heavy cables, and a glow control system.

You need a BIG radiator will oil cooler for the diesel.

What is your rear axle ratio? Typically, the diesel will SCREAM, and come up aginst the governor at highway speeds when replacing a gas engine with a diesel. (The governor in the IP will be set at various RPM's, based on the vehicle the engine came out of, with automatic tranny applications generally set lower.)

With a 4-speed, if you're not going to do heavy towing, you need 3.42 gears, and maybe even 3.08 gears to get crusing speed and economy.

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thejdman01

12-26-2006 15:57:17




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 Re: 350gas- to- 6.2 diesel in reply to Bob, 12-26-2006 15:07:55  
Bob is right big thing will be rear end. If not a 4x4 will be super simple. Radiator battery some different wiring (not tall that much glow plugs (can put a manual switch in if youw ant) and starter as far as wiring. could wire the fuel stop in or put a cable in. Not a big job. 6.2's are low on power and cold bloded unless everytings 100% but reliable and hard to kill.



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Bob

12-26-2006 15:07:49




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 Re: 350gas- to- 6.2 diesel in reply to Dave Sherburne NY, 12-26-2006 14:34:33  
Engine will bolt in. You will need a matching flywheel for the diesel. Exhaust is different, and won't match up. You need accessory mounts for the diesel. You need a second battery, heavy cables, and a glow control system.

You need a BIG radiator will oil cooler for the diesel.

What is your rear axle ratio? Typically, the diesel will SCREAM, and come up aginst the governor at highway speeds when replacing a gas engine with a diesel. (The governor in the IP will be set at various RPM's, based on the vehicle the engine came out of, with automatic tranny applications generally set lower.)

With a 4-speed, if you're not going to do heavy towing, you need 3.42 gears, and maybe even 3.08 gears to get crusing speed and economy.

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