Crank flanges and spacers
11-12-2019, 12:28 PM
#21
Staging Lane
Thread Starter
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.
11-12-2019, 01:03 PM
#22
Restricted User
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.
11-12-2019, 01:11 PM
#23
TECH Senior Member
There is NO difference in the covers. The pics make that obvious.
There has been NO design change in the covers.
FIX. THE. SEAL.
There has been NO design change in the covers.
FIX. THE. SEAL.
11-12-2019, 01:15 PM
#24
Staging Lane
Thread Starter
2005 LQ4 with GM FACTORY INSTALLED REAR MAIN SEAL.
2004 5.7 LS1
11-12-2019, 01:21 PM
#25
Staging Lane
Thread Starter
11-12-2019, 02:04 PM
#27
TECH Senior Member
In the pics of the above post, the seal is not installed correctly, neither is it in the last pic of your first post.
11-12-2019, 02:23 PM
#28
Restricted User
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.
11-12-2019, 02:40 PM
#29
Staging Lane
Thread Starter
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.
11-12-2019, 06:13 PM
#30
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.
11-12-2019, 07:35 PM
#33
TECH Senior Member
…. 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...
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01CamaroSSTx (11-12-2019)
11-12-2019, 08:15 PM
#35
11 Second Club
iTrader: (3)
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?
11-12-2019, 08:38 PM
#36
ModSquad
iTrader: (6)
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.
11-12-2019, 09:51 PM
#38
Staging Lane
Thread Starter
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.
11-13-2019, 02:32 PM
#39
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.
11-13-2019, 03:07 PM
#40
Staging Lane
Thread Starter
I did in post #21. The distance is the same. This thread was technically resolved by that post.
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Che70velle (11-13-2019)