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Question DetailsAsked on 6/9/2017

Can I get a oil cap for a lawn mower to bypass the oil filter

I have a lawn mower that my friend asked me to fix, they were messing around with the oil filter and somehow they managed to tear the threading where the oil filter goes. I was wondering if I could use an oil cap to bypass the oil filter. Is it possible to do so?

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1 Answer


Can't imagine the engine will be worth much in 10-20 hours if you run it without an oil filter. Also, engines are designed to run with a certain positive-side oil pressure, and removing the filter will probably significantly reduce that - so you may well not get the internal pressure it needs for lubrication.

Don't see how an oil cap is going to help - what will you thread it onto ? For externally mounted oil filters like cars have (and presumably your mower) they do make oil filter threaded adapters, designed to take different cartridge filter sizes - you might well be able to clean it up with matching die or thread chaser (if the threads are not totally shot) and put on an adapter with a goodly coating of locktite blue threadlock or QuickTape 249 (if threads are half decent) or even Permatex Ultra Black RTV sealant to hold it on permanently if threads are pretty bad - then the external thread on the adapter would be what you would screw the new larger bore size filter onto.

Or if threads are just a bit botched at the tip, use die or thread chaser to clean up the threads and use as is, or maybe with a touch of threadlocker blue or Quicktape 249 to hold it on better. (Do NOT use Red - takes high heat to remove). Of course, you would have to be sure the adapter/filter combination fits in the available space, that the filter has comparable or larger oil flow capacity, and that the adapter does not block the small holes around the center bore which the oil flows through to get into the filter.

Alternatively - some engine filter center bores are threaded in and can just be unthreaded and replaced - check parts list for your model. Otherwise, for bores which are press-fitted into the casting, likely to have to replace both the oil sump and the oil filter as a unit. Looks like about $25-50 range for the part depending on model, based on just looking up a few random ones from mower engine supply places - and of course depending on model may (likely) mean pulling the engine to replace it.

Answered 3 years ago by LCD

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