Murry 17.5 B&S Twin leaking from the bottom pan gasket

troy-built

troy-built

Well-Known Member
Hi
I have a Murry with a 17.5 B&S Twin motor that runs awesome but it leaks on the left side of the bottom pan. I cleaned it very good and there is no doubt that's where it's leaking from when running. My question is, is it common? I've looked for hours with no luck. I don't think it's just blow by as it runs to good.

Thanks for any help with this.
 
I've never seen an opposed twin leak at the sump gasket, but that doesn't mean it can't happen. Every engine gasket can go bad and start leaking.
 
Thanks for the reply, Yea I find it odd also. I cleaned it very good and got down with a light with it running and you can watch it run out of the pan. It's an old motor I believe it's from the 90s but it runs great.
 
My next question is, is it a big deal to replace the gasket? Working on a motor is no problem for me but I've never replaced one on a small motor.
 
The hardest part is getting the engine pulley off to get the engine out of the mower.
Expect to break an exhaust bolt .
The only trick is setting end float which is done by varying the number of gaskets .
 
bertsmobile1 said:
The hardest part is getting the engine pulley off to get the engine out of the mower.
Expect to break an exhaust bolt .
The only trick is setting end float which is done by varying the number of gaskets .
Click to expand...


The end float? So you need to figure how thick of a gasket you might need?

I might be wrong, I've been wrong before, but it looks like you can pull the motor intact and turn it upside down take off the pullys and pan and change the gasket. LOL I guess I'm looking at it like a small block chevy motor? Is it not that easy?
 
Scrubcadet10 said:
I've got a Full service manual for the Twin i can upload/PM you some pages if you need.
Click to expand...
I will let you know and thanks for offering to help. I want to see if it's worth the trouble. I sure don't want to part it out as it's just to good of a mower.
 
troy-built said:
The end float? So you need to figure how thick of a gasket you might need?

I might be wrong, I've been wrong before, but it looks like you can pull the motor intact and turn it upside down take off the pullys and pan and change the gasket. LOL I guess I'm looking at it like a small block chevy motor? Is it not that easy?
Click to expand...
That's how i did mine. I would also change the crankshaft seal, cheap insurance.
 
if it's still working good and running good, it's definitely worth the effort.

Briggs and Stratton 42A707-2238-E1 Parts Diagram for Sump

Briggs and Stratton 42A707-2238-E1 Sump Exploded View parts lookup by model. Complete exploded views of all the major manufacturers. It is EASY and FREE
www.jackssmallengines.com

the sump gaskets for this motor come in .005" thick, .009" and .015" thick.

Oil seal part, Briggs and Stratton 291675S
 
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