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L-134 rear main seal

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lowenuf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lowenuf Quote  Post ReplyReply Direct Link To This Post Topic: L-134 rear main seal
    Posted: 21 Jan. 2009 at 10:34am
Here is a factory sealed kit for the rear main seal on L-134's from serial #10001 until #224764..
 
GROUP 10-01                PART#637237                   PACKING, crankshaft rear
 
 
45 #10163 ACM #188
45 #10749 ACM #951 Dauntless V6, T-18 4-speed, D-44 F/R, D-20 twin stick
46 Bantam T3-C #8117
72 C10 Fleetside 355ci, 700r4, 12-bolt w/3:73's


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Howard Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jan. 2009 at 4:02pm
Hi Folks,
Seems appropriate to post this bulletin here. The 134 crankshafts that used the rope seal had little reason to maintain any degree of accuracy in the dimension of the crank at the seal surface. They have been measured with as much as 15/1000 variation in diameter at the ared located between the flywheel flange and the slinger on the crank. Again, using the rope seal was no problem for this variation. However if we are to use one of the newer style lip seals then this variation IS a problem. There have been some mismanufactured seals sold as well. Be aware....Many crank/seal failures have been documented as a result of wrong clearance issues. The answer has been to measure the crank and have that seal surface area machined Round and True to a dimension as listed in this bulletin...2.3 OD is good according to an experienced machine shop/builder. The machineing process would have to be done by someone who can grind crankshafts. It requires a very narrow stone to grind and will usually cost some extra to have done by the shop due to set up and tooling expense.
The image is a liitle hard to read...hope it is clear enough to you folks.
Edit: 1/28/09 This subject is still under some scrutiny by me and others. Please consider this data in my post as information only. I did not want to delete this post for informational purposes.
 
 
 
 


Edited by Howard - 01 Feb. 2010 at 8:49am
Howard F Jewett

1946 CJ2A #23353

43 GPW 106505 USA #20366014

43 Bantam Trailer T3 #14844

52 M100 K1119
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Howard Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2010 at 10:56am
Good Morning,
FWIW, I have installed a NOS Rope Seal without any problems to date. Thanks, Low, for your help!
GaryArf has installed a Napa Rear Main Rope Seal that was used as a replacement in another engine. He has had no problems either. Napa #BS5155. Thanks Gary for that number!
Because of material changes, the old seal as Low shows is no longer available except as NOS. Asbestos was a key component then. Heat build up and durability of these materials is now the concern. I would guess that the synthetics being used are very good.
The Felpro Gasket set sold now comes with a Rope Seal. There were some problems associated with some of the lip seals they were providing previously. I do not know how this particular new rope seal has been performing.
I do not know what these new rope seal are made of.
 
 
 


Edited by Howard - 23 Jan. 2010 at 10:58am
Howard F Jewett

1946 CJ2A #23353

43 GPW 106505 USA #20366014

43 Bantam Trailer T3 #14844

52 M100 K1119
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fritz Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan. 2010 at 7:31pm
i received my seals today.  i dont have near as much as what is in your kit.  i have 2 rope lenghts and 2 rubber/neoprene lenghts.  hope thats enough.  there was additional rope seal provided for the cam cover shaft part thingy.
 
eric
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