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6.2L Diesel Engine Discuss the 6.2 GM diesel engine & associated components.

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Old 07-06-2010, 05:52 PM   #1 (permalink)
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6.2 Oil leak and other things.

Just picked up my first 6.2 diesel, new to these engines but have prev. owned a 7.3. i know the 7.3 is alot more powerful than this non turbo 6.2 but while i was under it changing the oil (SAE 30 out 15/40 farm in) noticed there was a terrible leak coming from the oil pan. come to find out i could loosen the oil pan screws with my fingers. so tightened all of them up but i still have a slight leak from the front by the belt. is this normal? was also wondering what could be up with the 700r4 tranny in it. gotta let up off the pedal to shift? then it kicks like a mule when it does. someone mentioned a shift kit in the tranny. any ideas/tips/tricks to these motors would be helpful.
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Old 07-06-2010, 06:17 PM   #2 (permalink)
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I would replace the oil pan gasket if you havent already.
Got any pics of your truck?
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Old 07-06-2010, 09:42 PM   #3 (permalink)
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as far as i know there's no oil pan gasket from the factory. It's RTV, just like the valve covers are RTV for gaskets. Could be a rear main seal that's bad as well.
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Old 07-06-2010, 10:08 PM   #4 (permalink)
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Both of mine have gaskets and the both were leaking from the front. Disregard what I said if you dont have a gasket
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Old 07-06-2010, 10:11 PM   #5 (permalink)
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to DP.

(I have nothing for ideas on leaks... still looking for my own)

On to what I know enough to give (bad usually) advice on
It sounds like the TV cable isn't set properly, since you said its a 700r4. You can look at my stupid questions and the far better answers over in that thread (see link below). I will suggest you start your own, with 700r4 in the title to get more... (sometimes any) help with the tranny stuff. just put it in here, cause there isn't a 700r4 sub forum.
700r4 shifting question

A good title might be 700r4 - shift on pedal release only

Good luck on finding your leaks, and adjusting your tranny. Check the ATF, don't be stupid like me... that was part of my issue before started with my questions... I didn't even think that would have caused a ton of issues (i still need to replace my filter on it though)
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Old 07-07-2010, 03:05 PM   #6 (permalink)
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good advice on checking fluid..but if you dont know anything about the truck you might just drop the trans pan and do a filter job..look at what is in there..some brownish residue is normal, any shiny chunks should be looked into more..a black and burnt smelling fluid is usually a sign of trouble..if all looks good change fluid and adjust t.v. cable "probally several times to get it just right"..on your oil leak check cdr to be sure it is working properly if leak is severe and coming from behind pulley might be time for a front seal
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Old 07-07-2010, 06:05 PM   #7 (permalink)
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thank you all for the advice. after checking with a mech shop (see too funny post on 6.2) i crawled underneath and found a couple broken oil pan bolts. they looked fine in there but with a little adjusting with the wrench off came the heads. reverse tapped them and out they came new ones in and no leak so far! also adjusted the TV cable and def seems to shift tons better. maybe a bit more adjusting will do the trick.
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Old 07-07-2010, 06:24 PM   #8 (permalink)
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ya, the TV cable is a fine tuning, try it a few times adjustment. is your front leak from the pan, where the timing cover attachs to the pan or the balancer front seal?
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Old 07-07-2010, 06:54 PM   #9 (permalink)
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it was where the oil pan meets up to the timing chain cover...damn bolt was wedged in there would have never know it was broken if i hadnt tried reseating the oil pan.
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Old 07-07-2010, 09:36 PM   #10 (permalink)
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I'm happy that your tranny is behaving better for you... wait does that mean my advice might be getting better... hmm I'll think on that.
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