my ford truck loses oil pressure, and starts to knock after the engine gets warm why?

Question

I have already changed the oil pump and that wasn't it I was also told to check the bushings and bearings, the shop that changed my oil pump said that the bearings looked worn but didn't change them as per my request and they are charging me 600 bucks just to change the damn oil pump do you have any ideas as to what i could check into without costing me a small fortune? Any suggestions would be greatly appreciated!!

Answer 1

could be clogged oil filter or the oil pump they put in could be bad. did they really put it in? its a good idea to have the mechanic put your old parts in a box for you to examine later.

Answer 2

I easily have a 1987 Ford F-250 4x4, with a 4.9 engine (3 hundred-6 cyl. Any way, my oil rigidity became interpreting particularly low, espically after some miles of making use of, very comparable to yours. even nevertheless, i did not substitute my engine, what I did do became this... I gained a oil rigidity gauge, and, put in it today in place of the oil rigidity sending unit. Then i began out the truck, and, drove it some miles. Then, I checked the oil rigidity on the gauge that I had put in on the engine. The interpreting became what the Ford keep handbook had distinctive. So, I then proceded to do away with the oil rigidity gauge from the block, then I put in a decrease than the sprint after industry unit interior the truck. Now, my engine has the mandatory oil rigidity interpreting, as distinctive via the Ford keep handbook. So, you may attempt a oil rigidity gauge in place of the sending unit, and notice what the rigidity is then. additionally, you may replace the sending unit, itself. those tend to reason defective readings besides. Or, in case you come back to a variety to in elementary terms attempt the gauge in place of the sending unit, force the few miles, and verify the gauge interior the block, and, see what it says. in case you're satisifed, in basic terms installation a after industry unit decrease than the sprint. you may attempt the two one, or the two, in case you go with. That way, you're able to have a 2d opnion.

Answer 3

Too much clearance in regards to connecting rod and main journal bearings will cause low oil pressure and knocking.
When the engine get to operating temperature, oil thins out thus causing the oil light to illuminate and a knocking noise to start to be audible...
It's time to have the engine rebuilt at this point.

Answer 4

Maybe you should have changed the bearings. Sounds like one of the rod bearings may have spun. You didn`t mention the year or milage and engine size. Try a heavier weight oil, with an additive.

Answer 5

the most probable reason why the system usually looses oil pressure is when the filter gets choked....u can start off by checking the filter(oil)....check for the condition of the oil in the sump by comparing it with oil from another car if possible...this will give u an idea of the condition of the engineliner and piston rings. i suggest (if petrol car with carbuerator) get the carbuerator cleaned.

Answer 6

I would try changing the oil filter, could be partially collapsed, I have known that to happen on a couple of cars in my shop.

Answer 7

Use heavier oil.

After the next oil change put in 50w. NOT 20w-50, but just straight 50w.

Answer 8

You neglected to mention the age of your truck.
How many miles?
Do you drive it HARD?

The engine could just be worn out.....(crank bearings, connecting rod journals, cam bearings, lifters, etc.)

Answer 9

you might remove one valve cover and see if there is excess sludge build-up, if so, the oil maybe collecting in the valve covers and not draining back into the engine oil pan due to plugged oil return ports