6.2 flywheel question - TheDieselGarage.com
TheDieselGarage.com
 

Home Forum Who's Online Today's Posts Vendors Advertise
Go Back   TheDieselGarage.com > GM Diesel & Truck Discussion > 6.2L Diesel Engine

Thread Details Posted by jmlloar, this thread has received 8 replies and been viewed 3018 times.

TheDieselGarage.com is the premier Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 12-28-2010, 01:47 AM   #1
jmlloar
Junior Member
 
jmlloar's Avatar
 
Join Date: Dec 2010
Posts: 21
Points: 19,607
Thanks: 2
Thanked 0 Times in 0 Posts
6.2 flywheel question

I want to put a 6.2 engine into my C-65 chevy
It currently has a gas drinking 366 in it and 5-speed with 2 speed rear.
I would like to keep the big truck flywheel with its much larger clutch and tranny input shaft.

what is the diff between the diesel flywheel and the gas flywheel???

If it is just a diff in balance that can be fixed by matching the balance on the original 6.2 flywheel and the truck gas flywheel (bolt pattern at crank the same?)
The bell housing will fit fine, I just need to know the actual differences between the two engines flywheels. Like from say two identical trucks (my engine is '84) one with gas engine and one with diesel engine (just flywheel specs)
jmlloar is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-31-2010, 01:53 PM   #2
navistar45
Senior Member
 
Join Date: Dec 2008
Location: e.texas
Posts: 583
Points: 31,279
Thanks: 8
Thanked 62 Times in 51 Posts
The flywheel for the gasser is different than the one from the diesel. The diesel's is designed for more balanceing of the engine. Do not substitute! Cant remember clutch size of the mediums off hand but seems they were a tad bigger then the 1 ton under. Perhaps simply doing away with the piliot bearing of the diesel flywheel, will inable you to use the medium 5spd tranny to the 6.2 engine. I brainstormed this about 15 years ago, but have forgot much of the info. I was gonna install a c60 5spd behind a 6.2 in a 3/4 ton.. on edit it seems i remember everything will bolt up, it was the clutch size and input shaft that had me against a wall. Perhaps adapting the medium clutch to the 6.2 flywheel was the solution? This ofcourse means machine work. Also a word of advise if you dont know allready. The only thing you will gain is a bit better fuel mileage, the 366 was the better performer, especially with the low ratio rear the 2 ton likely has..

Last edited by navistar45; 12-31-2010 at 02:01 PM. Reason: additions
navistar45 is offline   Reply With Quote
Old 12-31-2010, 09:59 PM   #3
jmlloar
Junior Member
Threadstarter
 
jmlloar's Avatar
 
Join Date: Dec 2010
Posts: 21
Points: 19,607
Thanks: 2
Thanked 0 Times in 0 Posts
As I stated, I want the bigger 13" clutch from the med duty.

BALANCE is not a problem, the flywheel can be balanced to match the 6.2 with very little effort.

I will be using the adapter from the gas engine and larger tranny input. The pilot bearing is in the flywheel on the large clutch med duty trucks. (NEVER RUN WITHOUT AT LEAST A PILOT BUSHING, if its a close fit it will weld itself together (crank to input), if its a loose fit it will destroy the trans input bearing)

The main question I have simply is the bolt patern the same specs for gas engines and diesel engines from this era????

OR will the gas flywheel bolt onto the diesel engine (dont care if its correct)
Will all the bolts fit?

Last edited by jmlloar; 12-31-2010 at 10:02 PM.
jmlloar is offline   Reply With Quote
Old 12-31-2010, 10:08 PM   #4
jmlloar
Junior Member
Threadstarter
 
jmlloar's Avatar
 
Join Date: Dec 2010
Posts: 21
Points: 19,607
Thanks: 2
Thanked 0 Times in 0 Posts
[quote=navistar45;1052698]Cant remember clutch size of the mediums off hand but seems they were a tad bigger then the 1 ton under.[quote]

Not all med duty's used the larger clutch


Also If it was a 427 I would probably keep it as is, But after owning a few of these 366's I would best place them in the catagory of best use as a boat anchor. Old carbed ones were lucky to see 8mpg at best and very slow, powerful yes but slow
jmlloar is offline   Reply With Quote
Old 01-01-2011, 02:01 PM   #5
navistar45
Senior Member
 
Join Date: Dec 2008
Location: e.texas
Posts: 583
Points: 31,279
Thanks: 8
Thanked 62 Times in 51 Posts
I wasnt implying run without a piliot bearing, although re reading the post i could see the miscomunnication. sorry, remove the 6.2 bearing from the crank. As to the bolt lineup question, i have gone from 427 to 350 and vise versa in medium chevys[ engine swaps] and everything bolted up tranny and starter wise. Havin said this, i have seen folks go from 6.2 to 350/454 swaps before, and say everything underneath bolted in place. Also had a guy tell me he used the manual fywheel off a 350 on a 6.2 swap in he did, 6 month latter he was talking about the 6.2 breakin a crank at the back of the engine. In short i believe bolt up wise you will be ok. Simple thing to try would maybe go to you local napa dealer or such, see if they will let you compare flywheel bolt patterns.
navistar45 is offline   Reply With Quote
The Following User Says Thank You to navistar45 For this addition to TDG:
jmlloar (01-01-2011)
Old 01-01-2011, 02:38 PM   #6
jmlloar
Junior Member
Threadstarter
 
jmlloar's Avatar
 
Join Date: Dec 2010
Posts: 21
Points: 19,607
Thanks: 2
Thanked 0 Times in 0 Posts
That sounds like what I was looking for.

Any good maching shop can reballance the larger flywheel to the correct balance for the 6.2 engine. That would solve the broken cranks and rear cap problem. And would be an easy fix if it bolts up.

Thanks
jmlloar is offline   Reply With Quote
Old 01-01-2011, 02:41 PM   #7
jmlloar
Junior Member
Threadstarter
 
jmlloar's Avatar
 
Join Date: Dec 2010
Posts: 21
Points: 19,607
Thanks: 2
Thanked 0 Times in 0 Posts
Also the starter bolts to the bellhousing (if I remember correctly) so that would solve any starter to flywheel alignment problems.
jmlloar is offline   Reply With Quote
Old 01-02-2011, 01:21 PM   #8
navistar45
Senior Member
 
Join Date: Dec 2008
Location: e.texas
Posts: 583
Points: 31,279
Thanks: 8
Thanked 62 Times in 51 Posts
Hmmm, your straining my brain again. I know for fact the 6.2 starter bolts to the block. I havent been under a gm medium in over a year, that was to change the oil. I will have to get under my c70 gasser today and see where that starter bolts to, sure want to say it's the block based on memory. If thats the case, you shouldnt have any issues other then adapting the fly wheel.
navistar45 is offline   Reply With Quote
Old 01-03-2011, 01:14 AM   #9
jmlloar
Junior Member
Threadstarter
 
jmlloar's Avatar
 
Join Date: Dec 2010
Posts: 21
Points: 19,607
Thanks: 2
Thanked 0 Times in 0 Posts
Never messed with one newer than 71, But even the man trans pickup from this year bolted to the bell with 3 bolts. Starter had a cast iron head. You could never move the starter out far enough with it bolted to the block to fit the much larger flywheel.

Guess that's why they used the bellhousing mounted flywheel in the first place.
jmlloar is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Flywheel and clutch kit for 7.3 idi ontherks Supporting Vendors Forum 1 11-10-2009 02:19 PM
Flywheel 1964reo 5.9L Cummins 12 Valve (1994-1998.5) 1 12-16-2007 01:45 PM
Flywheel broke? 03cmmns 5.9L Cummins (2003-2007.5) 4 09-17-2007 11:15 PM
Which flywheel 01duramax6spd 5.9L Cummins (Pre 1994) 1 09-17-2006 05:56 PM
Flywheel n2diesel Whats Been Sold 3 07-14-2006 08:23 AM

New To Site? Need Help? TDG Specials

All times are GMT. The time now is 08:10 AM.



Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
DTO Garage vBulletin Plugins by Drive Thru Online, Inc.
vB.Sponsors
vBCredits v1.4 Copyright ©2007 - 2008, PixelFX Studios