J D LX188 Oli Pressure

super99

Well-known Member
My old Lx 188 has the oil pressure light come on after I mow a little bit. It's full of oil and I have replaced the sending unit on it, still does it. I have ran it long enough that if it didn't have any oil pressure it would have locked up long ago. I bought a oil pressure guage to check it, but the hole in the block for the sending unit is too small for the guage to fit into it. I don't understand electric guages. If it has a sending unit, does it have a receiving unit to tell the light to come on? I'd like to put a guage on it, do I have to get a metric thread guage to do this? Help, please!! Chris
 
Most of those senders that I have run into are 1/8 pipe thread. Don't know on your engine. Unscrew the unit and take evrything to a really good autopart store like some of the NAPA stores that have a component staff. They should be able to fit you up. Those engines have pretty low pressure so see what you have. Real tractor engines if in perfect shape can be in the 30 pound range. Ten to fifteen is also pretty good. See what others say.
 
It has a Kawasaki 2 cylinder water cool engine in it. I took the sending unit to Napa but they didn't have anything to go from 1/8 pipe to the sending unit. 1/8 pipe is just a little too large to fit in the hole. I wondered if the sending unit was metric thread? Chris
 
(quoted from post at 19:12:52 10/19/19) My old Lx 188 has the oil pressure light come on after I mow a little bit. It's full of oil and I have replaced the sending unit on it, still does it. I have ran it long enough that if it didn't have any oil pressure it would have locked up long ago. I bought a oil pressure guage to check it, but the hole in the block for the sending unit is too small for the guage to fit into it. I don't understand electric guages. If it has a sending unit, does it have a receiving unit to tell the light to come on? I'd like to put a guage on it, do I have to get a metric thread guage to do this? Help, please!! Chris

''Most likely, the sender provides a ground path for the warning light when pressure is low or missing.

John Deere parts on-line lists detailed information and specifications for many of their parts, but no info is given for your sender.

If you have a Harbor Freight store nearby, you can buy an oil pressure test gauge with MANY adapters for $24.99, dunno if you want to spend that much, but chasing down and buying the adapter you need won't be free, either.

Their SKU #62621.

Guess they sell on-line with reasonable shipping, as well.

Service manual says oil pressure light is to activate at between 10 and 18.5 psi.

Link to engine service manual: (.pdf format.)

http://www.mymowerparts.com/pdf/Kaw...90V-FD611V-KAWASAKI-SERVICE-REPAIR-MANUAL.pdf
 

INTERESTING, upon looking at the Service Manual, they specify that the sender is normal 1/8" tapered pipe thread.
 
I had a Polaris 4 wheeler and the hole for the sending unit was 1/8 BSP, just a little different than the NPT that we use, but quite common in the rest of the world. You could maybe make an adapter, the pipe is about the same diameter but the thread pitch is different. Or, you maybe could order a gauge off eBay.
 
You rang a bell. If you have a Briggs twin v engine and you want an oil filter. It looks like 1/2 inch pipe but it is straight like a bolt thread. You need that little pipe from a junked engine so you can screw on an oil filter. Ahhh the fun of being a back yard mechanic.
 
Yes, it seems like most lawn mower engines have 3/4 X 16 tpi, regardless of make or country of origin. I'm surprised Kawasaki uses 3/4 X 16. Our JD 4600 compact utility with a Yanmar engine has M20 X 1.5 threads.
 
Sorry i had my brain stuck on a pipe plug size. Yes they are 3/4 straight thread. They come right out of a busted engine with a really big easy out. Unscrew like magic. Put them in with a dab of locktite. Some of the Briggs Twin engines have a blank out plate instead of a filfer. I changed everything for filters.
 
I would contact Kawasaki for help. At a minimum they can help with correct thread size and they might be able to point you in the right direction.
 
(quoted from post at 13:48:51 10/25/19) I would contact Kawasaki for help. At a minimum they can help with correct thread size and they might be able to point you in the right direction.

Do you suppose they might have info that contradicts what the official Kawasaki manual for that engine clearly states?

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