<!-- from fixya rte -->What oil do I use in preasure washer pump - Garden

Dovyou have good oil preasure. Check to see if you have oil preasure your oil pump may have went on ya

Sure sounds like stopped up return passageways, common in old engines. Or a failing oil pump, not common. Are you sure about this low mileage? Pull a valve cover and check for sludge.

You could have three possable problems that I can think of. 1) Your oil viscosity is too low and you need to change it to a higher level. A 5w/30 or 10w/30 oil may thin out too much when it warms up to normal temp and shows low on your gauge. 2) The preasure relief valve is partially open due to a small piece of debris caught under the seat. Unscrew the oil filter and look at the small disk that is near the threded part on the filter base. Theres a spring behind it to keep it closed so all the oil goes into the engine and not bypass back into the oil pan. Push up on it slightly with a small tip screw driver and see that it fully seats in the hole, put a new filter on, and try it. 3) If these two things don't improve the condition, get a socket for taking the oil preasure sender off and get a oil preasure gauge to test the actual oil preasure the engine is producing. You may have a weak pump in the engine. If the preasure is within good specs, I'd change the sender unit with a new one.
Let me know what happened-
Craig

your bypass pressure valve is weak and needs replacing,its letting water pressure bypass the pump going to the pressure gun

try replacing the oil preasure switch, if that doesnt solve your problem then have your oil preasure tested, if it really doesnt have oil preasure it will cause internal engine damage so start with the switch and then go from there, hope this is helpful.

No this is normal. As an engine wears then oil preasure will be less this is not due to a weak oil pump but wear in crank shaft bearing's. When an engine is new and bearings are tight then oil preasure wont fall a lot from reved up to idle as the engine wear's oil escapes quicker from the crank shaft bearings. Reved up oil preasure increases idle it drops off. If the oil light stays out then their is enough preasure to lubricate the engine. In fact in an older engine high oil preasure is a worse complaint as this means the oil system is clogging. All is ok with your pump. If the oil preasure is moving up and down at constant rev.'s then the oil pump is faulty. Hope this put's your mind to rest.

Try starting the washer up without a nozzle clicked in and purging water through the pump, shut it down and install the nozzle and restart, if the motor lugs then it is making pressure, if the pump squirts water out of the by-pass immediately and or constantly it may be a stuck bypass and not a bad pump.

Check the oil. This is what happens when it is low on oil with my pressure washer. Kind of a safety feature.

check oil level. it has a low level shut off switch ?? May be it

it could be your oil preasure senser. if not that it sound like a bad oil pump. not good