Crank flanges and spacers
Thread Starter
Staging Lane
Joined: Jan 2015
Posts: 60
Likes: 2
From: Kuwait
OK so I took measurements of all my engines and looked at the rear covers.
First off, the depth between the crank flange and the bellhousing is the same.
Second, the seals are all installed correctly. Removed all the covers and checked. Like I said, my 2005 LQ4 still has a factory installed rear cover and seal. Nothing was backwards and they were seated all the way into the cover.
The ACTUAL DIFFERENCE is due to a change in the rear cover design. The mounting surface of the rear main seal protrudes by an additional ~4mm from the surface of the rear cover in the 2nd image when compared with the 3rd image, verified by caliper measurements on my engines. The part numbers for both rear covers is the same though. The rear main seals are also the same.
First off, the depth between the crank flange and the bellhousing is the same.
Second, the seals are all installed correctly. Removed all the covers and checked. Like I said, my 2005 LQ4 still has a factory installed rear cover and seal. Nothing was backwards and they were seated all the way into the cover.
The ACTUAL DIFFERENCE is due to a change in the rear cover design. The mounting surface of the rear main seal protrudes by an additional ~4mm from the surface of the rear cover in the 2nd image when compared with the 3rd image, verified by caliper measurements on my engines. The part numbers for both rear covers is the same though. The rear main seals are also the same.
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
OK so I took measurements of all my engines and looked at the rear covers.
First off, the depth between the crank flange and the bellhousing is the same.
Second, the seals are all installed correctly. Removed all the covers and checked. Like I said, my 2005 LQ4 still has a factory installed rear cover and seal. Nothing was backwards and they were seated all the way into the cover.
The ACTUAL DIFFERENCE is due to a change in the rear cover design. The mounting surface of the rear main seal protrudes by an additional ~4mm from the surface of the rear cover in the 2nd image when compared with the 3rd image, verified by caliper measurements on my engines. The part numbers for both rear covers is the same though. The rear main seals are also the same.
First off, the depth between the crank flange and the bellhousing is the same.
Second, the seals are all installed correctly. Removed all the covers and checked. Like I said, my 2005 LQ4 still has a factory installed rear cover and seal. Nothing was backwards and they were seated all the way into the cover.
The ACTUAL DIFFERENCE is due to a change in the rear cover design. The mounting surface of the rear main seal protrudes by an additional ~4mm from the surface of the rear cover in the 2nd image when compared with the 3rd image, verified by caliper measurements on my engines. The part numbers for both rear covers is the same though. The rear main seals are also the same.
Thread Starter
Staging Lane
Joined: Jan 2015
Posts: 60
Likes: 2
From: Kuwait
2005 LQ4 with GM FACTORY INSTALLED REAR MAIN SEAL.
2004 5.7 LS1
Thread Starter
Staging Lane
Joined: Jan 2015
Posts: 60
Likes: 2
From: Kuwait
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
At this point I'm going to have to assume you're trolling.
-1st,Your LQ4 in the last 2 posts aren't the same engine unless you gave it a bath after the first one.
-2nd, both of those LQ4 pics show the seal sitting slightly inside of the cover.
Look at the very top of the seal in the 1st pic and very bottom of the seal in the 2nd pic, you can see the face of the seal surface on the cover sticking out past the seal.
-3rd, both of the seals in the LS1 pics show the seal sitting out of the cover.
Look at the bottom of both pics. You can see the outer face of the seal that it supposed to be flush with the cover.
-4th look at the seal step depth. Look at the 2nd LQ4 pic at the top that shows this, and then either pics of the LS1 seals. It doesn't even appear to be the same seal.
Hose those suckers down with some brake cleaner so we can get a better look.
P.S., as G Atsma said, those don't look installed right, either.
-1st,Your LQ4 in the last 2 posts aren't the same engine unless you gave it a bath after the first one.
-2nd, both of those LQ4 pics show the seal sitting slightly inside of the cover.
Look at the very top of the seal in the 1st pic and very bottom of the seal in the 2nd pic, you can see the face of the seal surface on the cover sticking out past the seal.
-3rd, both of the seals in the LS1 pics show the seal sitting out of the cover.
Look at the bottom of both pics. You can see the outer face of the seal that it supposed to be flush with the cover.
-4th look at the seal step depth. Look at the 2nd LQ4 pic at the top that shows this, and then either pics of the LS1 seals. It doesn't even appear to be the same seal.
Hose those suckers down with some brake cleaner so we can get a better look.
P.S., as G Atsma said, those don't look installed right, either.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Staging Lane
Joined: Jan 2015
Posts: 60
Likes: 2
From: Kuwait
I honestly still can't see what you're seeing here. The seals look the same to me and they're both flush with the cover. I'll go back to the shop tomorrow, clean em up and take better pics.
11 Second Club
Joined: Jan 2003
Posts: 1,000
Likes: 134
I don't know why people are attacking the OP for asking a question. It doesn't look like the seal is sticking inwards nearly a whole 1/4" to me compared to what is proper seal fitment.
Is it possible the oem gasket on the rear main cover is missing on your engine that the crank flange is sticking out more ? making the rear main cover sit inwards and making you think the crank flange is different or the cover is a different thickness.
Is it possible the oem gasket on the rear main cover is missing on your engine that the crank flange is sticking out more ? making the rear main cover sit inwards and making you think the crank flange is different or the cover is a different thickness.
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
…. and I DO stand corrected! I had totally forgotten about the oil passage re-do early on. I had even read about it! LOOOONG ago....
However, that does not change the situation re: the seal position in the cover. The seal in question needs to be done right...
However, that does not change the situation re: the seal position in the cover. The seal in question needs to be done right...
This is an image of a stock LS1 rear cover with an LS1 crank in a 6.0 Gen III iron block. The rear seal looks to be correct in your pics after a closer look but I'm still rather confused as to what the question is?
OK so I took measurements of all my engines and looked at the rear covers.
First off, the depth between the crank flange and the bellhousing is the same.
Second, the seals are all installed correctly. Removed all the covers and checked. Like I said, my 2005 LQ4 still has a factory installed rear cover and seal. Nothing was backwards and they were seated all the way into the cover.
The ACTUAL DIFFERENCE is due to a change in the rear cover design. The mounting surface of the rear main seal protrudes by an additional ~4mm from the surface of the rear cover in the 2nd image when compared with the 3rd image, verified by caliper measurements on my engines. The part numbers for both rear covers is the same though. The rear main seals are also the same.
First off, the depth between the crank flange and the bellhousing is the same.
Second, the seals are all installed correctly. Removed all the covers and checked. Like I said, my 2005 LQ4 still has a factory installed rear cover and seal. Nothing was backwards and they were seated all the way into the cover.
The ACTUAL DIFFERENCE is due to a change in the rear cover design. The mounting surface of the rear main seal protrudes by an additional ~4mm from the surface of the rear cover in the 2nd image when compared with the 3rd image, verified by caliper measurements on my engines. The part numbers for both rear covers is the same though. The rear main seals are also the same.
Thread Starter
Staging Lane
Joined: Jan 2015
Posts: 60
Likes: 2
From: Kuwait
I don't know why people are attacking the OP for asking a question. It doesn't look like the seal is sticking inwards nearly a whole 1/4" to me compared to what is proper seal fitment.
Is it possible the oem gasket on the rear main cover is missing on your engine that the crank flange is sticking out more ? making the rear main cover sit inwards and making you think the crank flange is different or the cover is a different thickness.
Is it possible the oem gasket on the rear main cover is missing on your engine that the crank flange is sticking out more ? making the rear main cover sit inwards and making you think the crank flange is different or the cover is a different thickness.
THANK YOU! There it is. the ~4mm difference I was seeing with the caliper.
In the end, it's not even the distance from cover face to crank that really matters--it's the depth between the bellhousing mounting flange and the end of the crank. Just run a straightedge between two of the mounting bosses and get a depth measurement. As others have said, though, it just looks like the normal "short" crank with an incorrectly installed rear seal.
Thread Starter
Staging Lane
Joined: Jan 2015
Posts: 60
Likes: 2
From: Kuwait
I did in post #21. The distance is the same. This thread was technically resolved by that post.