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Heavy Blowby

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raski New Member Total Posts : 3 Scores: 0 Reward points: 0 Joined: 2024/05/06 04:45:13 Status: offline 2024/07/10 16:09:59 (permalink) 0 Heavy Blowby After getting this old Craftsman/Roper GT18 finally running, another issue could put a halt to this project. The engine is a B&S 18hp flat headed twin cylinder. Model number is 422437. Oil is being pushed out violently (with great force) from the two breather tubes into the air cleaner housing. A lot of oil will accumulate and get sucked into the air horn of the carburator, causing heavy blue smoking. Engine has to be halfway choked to run properly. I measured compression at 100 psi from both cylinders. Is it possible to get all this blowby even when compression appears good? post edited by raski - 2024/07/10 16:11:00 Quote #1 1 Reply Related Threads
SRTsFZ6 Super Member Total Posts : 2031 Scores: 74 Reward points: 0 Joined: 2018/11/18 07:20:58 Status: offline Re: Heavy Blowby 2024/07/11 08:58:15 (permalink) 0 Yes it's possible and it sounds like your problem... if the block isn't worn badly, (likely not), a re-ring (with a flat head) is fairly easy to do. Of course, re-hone the cylinder. . Scott Quote #2

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raski

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Total Posts : 3
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Joined: 2024/05/06 04:45:13
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2024/07/10 16:09:59 (permalink)

Heavy Blowby

After getting this old Craftsman/Roper GT18 finally running, another issue could put a halt to this project. The engine is a B&S 18hp flat headed twin cylinder. Model number is 422437. Oil is being pushed out violently (with great force) from the two breather tubes into the air cleaner housing. A lot of oil will accumulate and get sucked into the air horn of the carburator, causing heavy blue smoking. Engine has to be halfway choked to run properly. I measured compression at 100 psi from both cylinders. Is it possible to get all this blowby even when compression appears good?

post edited by raski - 2024/07/10 16:11:00

Quote #1

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SRTsFZ6

Super Member

Total Posts : 2031
Scores: 74
Reward points: 0
Joined: 2018/11/18 07:20:58
Status: offline

Re: Heavy Blowby 2024/07/11 08:58:15 (permalink)

Yes it's possible and it sounds like your problem...

if the block isn't worn badly, (likely not), a re-ring (with a flat head) is fairly easy to do.
Of course, re-hone the cylinder.

.

Scott

Quote #2

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