The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 03-25-2006, 07:11 PM   #1
Greubin
Registered User
 
Greubin's Avatar
 
Join Date: Dec 2005
Location: SJC
Posts: 158
crankshaft endfloat - .001"-.006" ya right!!

I pulled the th350 out of my truck to install the 700r4 today. While i was checking things out on the flexplate area, i checked the crank end float which I found to be about 1/16", forget about a few thou's of an inch ...I'm totally bummed. The engine runs strong - so now what do I do - I hate to pull the eng. at this point, I'm not ready for that. **** it, I'm installing the tranny throwing caution to the wind, may the engine gods have mercy!!

I'm pulling the damn thing - better to do it right than be sorry in the long run.
__________________
___________

Greubin
'71 C20 custom - GM Crate 350CI/290HP, BTO 700R4 level II, Qjet, and HEI

Last edited by Greubin; 03-26-2006 at 02:16 AM.
Greubin is offline   Reply With Quote
Old 03-25-2006, 09:22 PM   #2
bisquik65
Account Suspended
 
bisquik65's Avatar
 
Join Date: Apr 2004
Location: N.C. high country
Posts: 6,107
Re: crankshaft endfloat - .001"-.006" ya right!!

Looks to me that you may be pulling the motor out for a new crankshaft kit...If you dont the 700R4 front pump will get damaged by the converter moving forward and back everytime you stop and go...then it will tear the tranny up you just put it,It is about 150 for a crank kit...with bearings....I would advise to do it soon,so you wont be doing the engine and trans again...Not to much to fix it now... The 700R4 has an alumn front pump,unlike the Th350 you just pulled out that can take some abuse... Been there and done that several times,Just trying to help you save some $$...Erick
bisquik65 is offline   Reply With Quote
Old 03-25-2006, 10:02 PM   #3
Greubin
Registered User
 
Greubin's Avatar
 
Join Date: Dec 2005
Location: SJC
Posts: 158
Re: crankshaft endfloat - .001"-.006" ya right!!

Quote:
Originally Posted by bisquik65
Looks to me that you may be pulling the motor out for a new crankshaft kit...If you dont the 700R4 front pump will get damaged by the converter moving forward and back everytime you stop and go...then it will tear the tranny up you just put it,It is about 150 for a crank kit...with bearings....I would advise to do it soon,so you wont be doing the engine and trans again...Not to much to fix it now... The 700R4 has an alumn front pump,unlike the Th350 you just pulled out that can take some abuse... Been there and done that several times,Just trying to help you save some $$...Erick
didn't know there was a crankshaft kit available. Um, so is it possible to install the crank kit with engine installed?
__________________
___________

Greubin
'71 C20 custom - GM Crate 350CI/290HP, BTO 700R4 level II, Qjet, and HEI

Last edited by Greubin; 03-25-2006 at 10:03 PM.
Greubin is offline   Reply With Quote
Old 03-25-2006, 10:10 PM   #4
bisquik65
Account Suspended
 
bisquik65's Avatar
 
Join Date: Apr 2004
Location: N.C. high country
Posts: 6,107
Re: crankshaft endfloat - .001"-.006" ya right!!

Its alot easier to remove the motor and put it on a stand,then turn is over,pull the timing cover and pan,then lossten rods and mains caps,then remove crank carefully... going back is imporant not to nick the crank with the rods.. It can be done in the truck ,but faster to pull it out and back in...

The crank kit gives you recond. crack,rod and main bearings..while your there put a stock oil pump in,cheap insurance..About 200 in parts,local store
bisquik65 is offline   Reply With Quote
Old 03-25-2006, 11:21 PM   #5
wolfthing2000
Account Suspended
 
Join Date: Oct 2004
Posts: 1,276
Re: crankshaft endfloat - .001"-.006" ya right!!

Sounds like it's time to pull the mill. It is way easy on a stand and don't even think about doing it under the truck!!! I have changed out a rod bearing before, but that is pretty minor. At the same time it wouldn't cost toomuch more to rebuild the engine.
wolfthing2000 is offline   Reply With Quote
Old 03-25-2006, 11:31 PM   #6
Greubin
Registered User
 
Greubin's Avatar
 
Join Date: Dec 2005
Location: SJC
Posts: 158
Re: crankshaft endfloat - .001"-.006" ya right!!

After having dinner and a frosty beverage, I agree that the best thing to do is pull the engine. I just installed fresh heads about 500mi ago. I doubt a shortblock will set me back that much. Better to do it right then take shortcuts.
__________________
___________

Greubin
'71 C20 custom - GM Crate 350CI/290HP, BTO 700R4 level II, Qjet, and HEI
Greubin is offline   Reply With Quote
Old 03-26-2006, 12:51 AM   #7
krue
Designated A-hole!
 
krue's Avatar
 
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
Re: crankshaft endfloat - .001"-.006" ya right!!

Better to do it right, than to do it over.
__________________
"If it ain't broke, fix it 'til it is!"
Being stupid ain't illegal.

We're Still Debt Free Except for the House!!!
www.daveramsey.com

70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e
93 S-10 "Poppaw's Truck"
krue is offline   Reply With Quote
Old 03-26-2006, 01:26 AM   #8
VetteVet
Msgt USAF Ret

 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,718
Re: crankshaft endfloat - .001"-.006" ya right!!

Well I hate to disagree with all you guys but if you're worried about the torque converter damaging the front pump then you must remember how much you have to move it forward to bolt it to the flexplate. It's way more than .060. If there were issues with oil burning or low compression then I would go ahead and rebuild the engine. If it's a racer then yeah but for a driver then I think it will be fine. After all its been running excellent. JMHO
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 03-26-2006, 01:35 AM   #9
wolfthing2000
Account Suspended
 
Join Date: Oct 2004
Posts: 1,276
Re: crankshaft endfloat - .001"-.006" ya right!!

Okay. Let's think about that end playn number one more time okay??? A 1/16 of an inch is like way over .060 and that is almost 10xs that is Ten times !!!!!!! the limit. What or why or how come or what if or whatever is letting this be is MAJOR concern. Period!
Pull it !!!!


Rebuild it!!!
wolfthing2000 is offline   Reply With Quote
Old 03-26-2006, 03:21 AM   #10
VetteVet
Msgt USAF Ret

 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,718
Re: crankshaft endfloat - .001"-.006" ya right!!

Quote:
Originally Posted by wolfthing2000
Okay. Let's think about that end playn number one more time okay??? A 1/16 of an inch is like way over .060 and that is almost 10xs that is Ten times !!!!!!! the limit. What or why or how come or what if or whatever is letting this be is MAJOR concern. Period!
Pull it !!!!


Rebuild it!!!
Ok lets think about that endplay thing . 1/4 " = .250 1/8 " = .125
and 1/16"=.0625
I still wouldn't pull an engine that hadn't given me any problems. Besides we don't know for sure that he has that much endplay.
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 03-26-2006, 04:13 AM   #11
Greubin
Registered User
 
Greubin's Avatar
 
Join Date: Dec 2005
Location: SJC
Posts: 158
Re: crankshaft endfloat - .001"-.006" ya right!!

Quote:
Originally Posted by VetteVet
Ok lets think about that endplay thing . 1/4 " = .250 1/8 " = .125
and 1/16"=.0625
I still wouldn't pull an engine that hadn't given me any problems. Besides we don't know for sure that he has that much endplay.
I'm pretty sure, I measured the crank endplay it's right at .125" give or take. The tranny did make a clunking sound during stop and go's before I pulled it. I'm not going to throw away the $1700 I spent on a new 700r4 install to tired bottom end.
__________________
___________

Greubin
'71 C20 custom - GM Crate 350CI/290HP, BTO 700R4 level II, Qjet, and HEI
Greubin is offline   Reply With Quote
Old 03-26-2006, 04:35 AM   #12
VetteVet
Msgt USAF Ret

 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,718
Re: crankshaft endfloat - .001"-.006" ya right!!

Quote:
Originally Posted by Greubin
I'm pretty sure, I measured the crank endplay it's right at .125" give or take. The tranny did make a clunking sound during stop and go's before I pulled it. I'm not going to throw away the $1700 I spent on a new 700r4 install to tired bottom end.
Well I don't blame you for that and I certainly would agree that .0625 is a lot of endplay. When you get the engine out and torn down check the clearance between the rear main cap and the crank to see what the actual endplay is.
BTW are you familiar with setting up a 700r4 as far as the tv cable and the line pressures? You can damage that tranny far easier that way if they aren't set up correctly. There is tons of information in the boards so good luck and enjoy your ride. VV
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 03-26-2006, 02:03 AM   #13
GMCPaul
Senior Member
 
Join Date: Mar 2000
Location: Rockville,In. USA
Posts: 3,721
Re: crankshaft endfloat - .001"-.006" ya right!!

That much end play will Definately damage the Transmission, I had one that broke 2 TH350 bellhousings almost completly off the transmissions in a 3 week period and that motor when we checked the end play had less than 1/2 what you have currently, save money by not replacing a tranny every few weeks and take care of the bottom end.
GMCPaul
GMCPaul is offline   Reply With Quote
Reply

Bookmarks

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


All times are GMT -4. The time now is 08:46 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com