66 diff leak
#1
66 diff leak
I'm changing out the rear spring on my 66 coupe(HD 3:36). I removed the 4 bolts and plate that hold the spring to the diff and I now notice a few drops of gear lube coming out of one of the bolt holes. I left the bolt out for several days and it has not stopped. Is this normal or is my diff cracked? What say you.
#2
Racer
I'm changing out the rear spring on my 66 coupe(HD 3:36). I removed the 4 bolts and plate that hold the spring to the diff and I now notice a few drops of gear lube coming out of one of the bolt holes. I left the bolt out for several days and it has not stopped. Is this normal or is my diff cracked? What say you.
#3
Race Director
No it's not normal, the problem probably is from someone putting a longer bolt in that hole than original. It's a blind hole and a longer bolt will break thru the casing , causing the leak. This can be fixed from the inside using JB weld , or replace the casting. You know how I know this... Hope this helps Jeff
You might get by for awhile just using a thread sealant on the bolt. Heavy duty replacement rear covers are available from Muskegon Brake.........and also used originals are also out there if you search. But you may never find/get the original codes..........if that matters to you.
Larry
#5
Melting Slicks
Member Since: Jul 2005
Location: Cuyahoga Falls OH
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Just wondering...are all four bolts for mounting originally the same length or are two of them that go into the cover shorter? In other words, can you mix up the original bolts on an install and break the cover? Dave
#6
Race Director
The two bolts that thread into blind holes are the critical ones that require checking.........the other two don't really matter as long as they go thru all the rear cover threads.
Reproduction springs and reproduction spring liners are a different thickness than originals, so any changes/replacements to them will also affect the required/needed bolt length. Do not just assume that all is well.
Larry
#7
Melting Slicks
Member Since: Jul 2005
Location: Cuyahoga Falls OH
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They SHOULD all be the same length..............but you never know on a 50 year old car what is/was installed in the past.
The two bolts that thread into blind holes are the critical ones that require checking.........the other two don't really matter as long as they go thru all the rear cover threads.
Reproduction springs and reproduction spring liners are a different thickness than originals, so any changes/replacements to them will also affect the required/needed bolt length. Do not just assume that all is well.
Larry
The two bolts that thread into blind holes are the critical ones that require checking.........the other two don't really matter as long as they go thru all the rear cover threads.
Reproduction springs and reproduction spring liners are a different thickness than originals, so any changes/replacements to them will also affect the required/needed bolt length. Do not just assume that all is well.
Larry
I've wondered since how that could have happened. The bolts may have been replaced before since the spring I replaced wasn't original. Thanks for the info. Dave
Last edited by dkleather; 02-18-2017 at 11:32 AM.
#8
I'm changing out the rear spring on my 66 coupe(HD 3:36). I removed the 4 bolts and plate that hold the spring to the diff and I now notice a few drops of gear lube coming out of one of the bolt holes. I left the bolt out for several days and it has not stopped. Is this normal or is my diff cracked? What say you.