Discussion in 'Engines' started by Racerx4772, Jul 25, 2022.
Motors have around 2000 hours , What's good oil pressure and water temperature ?
When on plane expect about 40psi
At 1000rpm expect about 20psi.
Normal temp is about 175-180.
Thank you , what's the correct oil for those motors and about how many quarts or gallons ?
In warm climates, 40w, CF2 oil. Napa fleet, Shell T1. Delo 100.
Must have that API CF2 Rating.
Do not let 5psi oil pressure upset you at idle and hot. It is flowing oil.
Check oil level cold. First thing in the morning. Then, just fill to the full line, not over.
Just shuting down a few minutes and dipping the oil will make you think it is low. It is not.
Lots of oil stays in the galleys for a long time.
Thank you !
Don't let the temp get over 180 or you'll be replacing a head.
Thanks , that's what I was concerned about .
One motor is good on temp . I'm starting to think the wrong oil was used in the other one and causing that motor to have a higher temp . Probably best to change it and see what happens .
Any idea of how many quarts or gallons of oil ?
Depends on the oil pan, but probably in the 6 gallon range.
Oil is on the bottom of the list of things causing warmer operation.
External pick-up/strainer, internal strainer, rubber raw water pump impeller, heat exchanger, coolant level, thermostat, proper temp sender-gauge working and exhaust dump can/shower head.
An IR heat gun would be the first tool to pick up while shopping.
An other thought, start asking around for a trust worthy Detroit tech.
That's about right.
Thanks for all the information !! Cars , motorcycles , houses , race cars , motor coach , campers , collision repair are my background Boats not so much . Only thing i know about that motor is it has fresh oil and looks clean - water pump impeller has been changed . Low rpm under 900 cooling temp on gauge good over that while under way it was showing above 180 . I do have my IR heat gun at the boat , was checking ac temps .
Define "above 180"
gauge was reading 195 on that motor above 1000 rpm and cooled quickly under 1000
If it's truly hitting that number you've got an issue that needs looking into. Perhaps heat exchangers are due for cleaning if your in salt water.
yes I'm in salt , prior owner had boat sitting 95%of the time although he ran the motors once a month is what he said . You can chemically clean those is that correct ?
What kind of strainer does it have?
lol , no idea .
there is a strainer that I've cleaned for the a/c water line . Is it like that one ?
195 while not destructive is very high at low RPM. It s ok for a DD to hit 195 when running at WOT but not at cruise and certainly not at “above 1000”
Follow the list Ralph posted.
how much water is flowing out the exhausts?
if you have to clean the system, circulating barnacle buster thru the raw water circuit using a bucket and a bilge pump is one way to do it but if you re not familiar with diesels and don’t have the engine manual you should have a mechanic do it. You will learn a few things too.
most boats have internal strainers like the AC but bigger. Hard to miss. Also check the outside water inlet for growth and debris. When is the last time a diver cleaned the bottom?
Good advice , ill call the mechanic # I have but may try to find someone else . The boat was hauled out a month ago for Survey and was very clean on the bottom . about a 15 minute pressure wash and new zincs were installed .
There are no strainers on the mains on this boat. It has the external ones that don't allow weeds and debris to enter, the name escapes me, perhaps Pascal will remind me.