GM pilot bearing help?
12-06-2010, 12:03 AM
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GM pilot bearing help? I am adapting a colorado MA5 transmison to a GM 2007 4.8L, using a camaro flywheel, and luk clutch, advanded adapters bellhouisng (Jeep Ax-15 to Chevy V8) same bolt pattern as the colorado. I have the two bolted to geather and I need more space for the internal salve, so I am going to get a 3/8 bellhousing spacer.
With out the spacer my input shaft allmost fits into my crank. my pilot bearing could be 1/8" longer to be perfect. so 1/8" plu 3/8" the sapcer would be perfect if I had a .4" longer pilot bearing
I need a pilot beaing ID of 0.8397" or 22.7mm
OD 1.096"??
0.4" longer than normal
Do all the Gen III (4.8,5.3,6.0, and LS1/LS2) engines share the same pilot bearing bore diameter?
How come a 2004 4.8L shows a bearing acdelco part # CT1082 wiht a OD 43.3mm id 22.7mm
And a LS1 camaro pilot bearing is 1.096" 27.8384mm OD .6" 15.24mm ID
I thought the crank counter bore was the same for all Gen II engines?
is it possable that the truck pilot bearing CT1082 is stepped? OD is 43.3mm and ID is 22.7mm and perhaps a step of 1.096"? I have a feeling that this is also .4-.5" longer as the 1999 4.8L wiht a manual had a .4-.5" longer crankshat, and they use the same tranny as the 2004 do but they have the short style crank shaft.
I would love to see a pic of the Acdelco CT1082 it is also used on a SSR with a M12 T56. I would have the think that they SSR and 6.0L/4.8L trucks don't have there own specail crank??
With out the spacer my input shaft allmost fits into my crank. my pilot bearing could be 1/8" longer to be perfect. so 1/8" plu 3/8" the sapcer would be perfect if I had a .4" longer pilot bearing
I need a pilot beaing ID of 0.8397" or 22.7mm
OD 1.096"??
0.4" longer than normal
Do all the Gen III (4.8,5.3,6.0, and LS1/LS2) engines share the same pilot bearing bore diameter?
How come a 2004 4.8L shows a bearing acdelco part # CT1082 wiht a OD 43.3mm id 22.7mm
And a LS1 camaro pilot bearing is 1.096" 27.8384mm OD .6" 15.24mm ID
I thought the crank counter bore was the same for all Gen II engines?
is it possable that the truck pilot bearing CT1082 is stepped? OD is 43.3mm and ID is 22.7mm and perhaps a step of 1.096"? I have a feeling that this is also .4-.5" longer as the 1999 4.8L wiht a manual had a .4-.5" longer crankshat, and they use the same tranny as the 2004 do but they have the short style crank shaft.
I would love to see a pic of the Acdelco CT1082 it is also used on a SSR with a M12 T56. I would have the think that they SSR and 6.0L/4.8L trucks don't have there own specail crank??
12-06-2010, 12:23 AM
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I think I figured it out the LS6 GM 4.8L/6.0l truck SSR all use a acdelco CT1082 bearing that sits flush wiht the flywheel in the large bore about a .5" more than normal LS1 etc..
12-06-2010, 02:12 AM
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I can help answer some of your questions. There are 2 different types of pilots...the old style and the new style (sealed roller). The old style is smaller and fits down inside the crank. The new style fits in the bigger bore right at the rear of the crank.
The new style is really a better bearing IMO, since it doesn't ride directly on the input shaft. It has its own inner and outer races. I designed and had some 3/8in spacers made with a CNC plasma cutter. It goes between the bellhousing and tranny & is made of aluminum. So it blends nicely with the bellhousing, and is hard to tell its even there. You will also have to shim the slave in order to make up for this spacer. I have 0.125" and 0.875" slave spacers, but can get any size you need made.
Hope this helps!
The new style is really a better bearing IMO, since it doesn't ride directly on the input shaft. It has its own inner and outer races. I designed and had some 3/8in spacers made with a CNC plasma cutter. It goes between the bellhousing and tranny & is made of aluminum. So it blends nicely with the bellhousing, and is hard to tell its even there. You will also have to shim the slave in order to make up for this spacer. I have 0.125" and 0.875" slave spacers, but can get any size you need made.
Hope this helps!
12-06-2010, 02:33 AM
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I can help answer some of your questions. There are 2 different types of pilots...the old style and the new style (sealed roller). The old style is smaller and fits down inside the crank. The new style fits in the bigger bore right at the rear of the crank.
The new style is really a better bearing IMO, since it doesn't ride directly on the input shaft. It has its own inner and outer races. I designed and had some 3/8in spacers made with a CNC plasma cutter. It goes between the bellhousing and tranny & is made of aluminum. So it blends nicely with the bellhousing, and is hard to tell its even there. You will also have to shim the slave in order to make up for this spacer. I have 0.125" and 0.875" slave spacers, but can get any size you need made.
Hope this helps!
The new style is really a better bearing IMO, since it doesn't ride directly on the input shaft. It has its own inner and outer races. I designed and had some 3/8in spacers made with a CNC plasma cutter. It goes between the bellhousing and tranny & is made of aluminum. So it blends nicely with the bellhousing, and is hard to tell its even there. You will also have to shim the slave in order to make up for this spacer. I have 0.125" and 0.875" slave spacers, but can get any size you need made.
Hope this helps!
On my current setup with the salve spring removed and pushed allway in I try to bolt up the bellhousing to transmsion and it pushes on the clutch fingers 1/16-1/8" So I need to space the bellhousing, this will also help get my input shaft right, with a 3/8" sapcer my intput will be 0.495" away from the small style crank pilot location so the acdelco CT1082 and 3/8" bell sapcer should work perfect. 3/8"- 1/8" = 1/2" minus what 1/4" air gap? =1/4" so I should need a 1/4" slave spacer? I assume they are stackable? could I get an assortment, maybe return what I don't use? I asumme they would cost allmost nothing to ship?
-I need from you 3/8" bellhousing spacer for LS1 bolt pattern
- salve shim(s) 1/4" or two 1/8" , 1/8", 3/8" for f-body internal slave
- Ct1082 larger style pilot bearing can source locally but you probably have it cheaper
- do I need longer dowls for the bellhousing spacer?
prices plus shipping to 98230 blaine, washington, US also quote on shipping within 7 bussiness days! Thanks -Jamie
any tips on installing that large pilot bearing? just hammer it in with a large peice of pipe? Do you have specail installer for it? I have a hard enough time installing a regular small pilot bearing!
