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Author Topic: Rear seal oil leak  (Read 143 times)

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Dwainideus

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Rear seal oil leak
« on: May 31, 2021, 10:44:26 AM »

I have an oil leak which appears to be coming from the rear of the engine (M-25XP).  It only shows after running the engine, and appears as a steady drip from the area on the back of the engine in the vicinity of the starter.  I assume this is probably a lip seal issue?  Question:  can the seal be replaced without removing the engine? 
I've searched the message board, tech wiki, and tech notes...just want to make sure...
1990 Catalina 34 1.5
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Ron Hill

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Re: Rear seal oil leak
« Reply #1 on: May 31, 2021, 01:12:45 PM »

Dwain : "Can that rear oil seal be change without removing the engine"  the answer is NO (just like you expected!!)  I went thru that drill and wrote up my happenings in the Mainsheet tech notes.  The front seal is easily changed, but to get at that rear lip seal you'll have to remove the engine.  Look under "Removing the Engine".

I replaced that rear crankshaft lip seal and the race the seal rides on.  As it happened I finally removed the engine and took it to a Kubota dealer who did the job. 

A few thoughts
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KWKloeber

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Re: Rear seal oil leak
« Reply #2 on: May 31, 2021, 03:40:44 PM »

Dwain
Make sure it’s not the oil pressure switch above the butt-end of the starter leaking and running down the block to that drip spot.

Caveat: I presume you don’t have an “A” or “B” engine (which have remote oil switches.)

[edit]:
Ooops I just noticed in the email that you have an XP (not A or B)
« Last Edit: May 31, 2021, 03:42:36 PM by KWKloeber »
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Paulus

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Re: Rear seal oil leak
« Reply #3 on: May 31, 2021, 05:26:38 PM »

Dwain,  You might check the valve cover casket.  A problem I had a few years back.
Paul
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Ron Hill

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Re: Rear seal oil leak
« Reply #4 on: June 01, 2021, 02:16:51 PM »

Dwain : When you confirm that it is the rear lip seal, you should think about a new damper plate while the bell housing is off.

A thought
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Dwainideus

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Re: Rear seal oil leak
« Reply #5 on: Today at 06:32:09 AM »

Thanks to all for the input!
After much prodding and poking, I think it might be more of a coolant leak than an oil leak, or a combination of both.  I had just changed the oil, so it's really clean, making it difficult to differentiate from coolant. 
Yesterday I ran the engine at length trying to locate where the liquid is coming from.  Still appears to be dripping from the bell housing on the port side of the engine.  Can't see all the coolant hose connections to see if one of them might be leaking.
Anyone had a similar experience?
Thanks!
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Noah

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Re: Rear seal oil leak
« Reply #6 on: Today at 08:36:14 AM »

Thanks to all for the input!
After much prodding and poking, I think it might be more of a coolant leak than an oil leak, or a combination of both.  I had just changed the oil, so it's really clean ….Can't see all the coolant hose connections to see if one of them might be leaking.
Until you “confirm the integrity” of all hoses and clamps, I don’t know what anyone here can recommend?
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KWKloeber

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Re: Rear seal oil leak
« Reply #7 on: Today at 08:45:19 AM »

On the port side you have only the:

   * 7/8” exhaust manifold-to-Hx inlet hose.

  * 5/8” Hx outlet to vented loop hose.

  * Exhaust flange gasket.

Hose locations and coolant flow diagram are in the manual on the wiki!
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain
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