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Mend Tecumseh 143.996510 Replace Part Engine

How to replace a part in the engine?

I have a..........
Craftsman Eager-1
6.5 Horse Power Walk Behind Lawnmower
Power Gear Drive
22 inch cut

Engine Model Number: 143.996510
Engine Family: WTPXS.1951 BA
Displacement: 195
This mower is in good shape and was given to me, but I need to replace a part and I need to know how to do it, and where the part is located in the engine. The part is in a small plastic bag that says on it:
ORIGINAL SERVICE PART
TECUMSEH
# 27897 (number on the bag)
The part is an O-ring of some kind. It's made of aluminum and about as big around as a silver dollar. There is a black rubber washer attached to it's inner circle, and that washer is encircled by a small steel spring. The previous owner said there was a problem with the dip stick tube coming out during use, and that the part is supposed to fix that problem.
I hope you can help me.

Skip Mathews
December 2005

Tecumseh Tecumseh 143.996510 Garden Tools, Lawn Mowers Replace Part Engine

Thanks BG,
I'm glad I asked before I tampered with the engine....

skip
December 2005

OK I see where you said it had a spring that encircled it ...Ok my mistake it is a crank seal .....what this has todo with dipstick coming out I don`t know ...

bg
December 2005

I looked it up and its a lower crankshaft oil seal ......not much to replacing it other than taking cutting blade off and prying old seal out and installing new one by tappin it in place be carefull not to misshape in progress....it doesn`t have a spring on it but thats the part number you listed .........you can goto
Outdoor distributors on the ineternet and pull up part number and exploded view of engine and where it goes ......or theres a toll free # you can call 1-877-70-PARTS

bg
December 2005