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185 rear main seal question

IH CUB Lo-Boy Series - 154, 184, 185 Forum -- Questions and answers to all of your Lo-Boy related issues.
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56FordGuy
10+ Years
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Posts: 32
Joined: Fri Apr 23, 2010 11:41 pm
Zip Code: 37022
Tractors Owned: 154 LoBoy, 185 LoBoy, IH 424, Ford 8N
Location: TN, Sumner County

185 rear main seal question

Postby 56FordGuy » Sat Oct 09, 2010 1:48 pm

I began replacing the rear main/ crankshaft seal today. I'm ready to install the new one, but I'm concerned that it isn't seating properly in the aluminum plate. It just falls in with a light push, and fits very loosely. I'm concerned that the old seal may have spun and enlarged the hole it seats in.

Is the seal supposed to fit so loosely, or do I need to try and find a replacement aluminum plate? Any ideas where I could find one if it's necessary?

Thanks

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b52c130
10+ Years
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Posts: 188
Joined: Wed Sep 03, 2008 4:35 pm
Zip Code: 07869
Location: Randolph, NJ

Re: 185 rear main seal question

Postby b52c130 » Sat Oct 09, 2010 9:31 pm

The rear crankshaft seal will not be a
tight fit into its recess in the rear aluminum seal holder; plan on using some
Locktite 609 cement to hold it in place. (IH changed the
machining of the rear block plate, but 99% of the seals you buy will still be sized
for the older design.)

Put the Loctite 609 around the entire OUTSIDE of the metal part of the
seal where it contacts the back of the engine or else the outer seal surface will
surly leak.

Hope that this helps, NJDale

56FordGuy
10+ Years
10+ Years
Posts: 32
Joined: Fri Apr 23, 2010 11:41 pm
Zip Code: 37022
Tractors Owned: 154 LoBoy, 185 LoBoy, IH 424, Ford 8N
Location: TN, Sumner County

Re: 185 rear main seal question

Postby 56FordGuy » Sat Oct 09, 2010 10:15 pm

Dale,

That's exactly what I needed to know, thanks a bunch. My new seal is a double lip type, I thought the open part of the lip faced in toward the aluminium block. Do I have that backwards?

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b52c130
10+ Years
10+ Years
Posts: 188
Joined: Wed Sep 03, 2008 4:35 pm
Zip Code: 07869
Location: Randolph, NJ

Re: 185 rear main seal question

Postby b52c130 » Sun Oct 10, 2010 12:30 pm

The 'open' part of the seal casing should face toward the interior of the motor. The 'solid' end of the seal should face outward, away from the engine and toward the flywheel.
Attachments
184 Rear Main Oil Seal.jpg
Rear Main Oil Seal - 184

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bob in CT
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Joined: Thu Jun 07, 2007 9:34 am
Zip Code: 06040
Tractors Owned: 77 Cub (red); 74 Cub; 52 Cub; 50 Cub ( post-demo)
Circle of Safety: Y
Location: CT, Manchester

Re: 185 rear main seal question

Postby bob in CT » Sun Oct 10, 2010 12:38 pm

There is a better fix for this problem. The seal changed and it no longer fits properly in the housings. A seal with a larger OD is available and housings are machined for the new seal with a proper 005-007 crush fit. Contact forum member Phil Lenke for a machined housing and new seal. As a bonus the housings are faced off too as many of them are not flat either. This is a far more reliable fix than adhesives which have had mixed results.

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bob in CT
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Posts: 6018
Joined: Thu Jun 07, 2007 9:34 am
Zip Code: 06040
Tractors Owned: 77 Cub (red); 74 Cub; 52 Cub; 50 Cub ( post-demo)
Circle of Safety: Y
Location: CT, Manchester

Re: 185 rear main seal question

Postby bob in CT » Sun Oct 10, 2010 12:55 pm



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