Originally Posted by C38
I just checked my oil
after using it may times and checking it. All has been fine till now. I had rebuilt the custom made heat exchange from Gustafson. The boat
is a Nauticat 38. How can I clean the engine
from the thick gray mess?
Thanks in advance
Assuming you mean 'thick grey mess' is inside
If so, first remove injectors so the engine can easily be turned over without compression
Drain (or pump
out) whatever gray mess you can.
Refill with clean (but cheap) thin oil and replace oil filter
Circulate the new thin oil by using the starter motor
for say 20 to 30 second busts and checking the starter motor
temperature as you do so. A decompressed engine does not place a heavy load on the starter motor (or start battery) but you still need to check the temperature.
Change the oil and filter after several minutes of circulating the oil.
Repeat with another change of oil and filter.
Repeat (again) with another change of oil and filter.
When you feel happy enough that the grey stuff is well and truly gone, again fill with new oil (of the correct grade) and new filter. Refit
the injectors, bleed and start.
Run under load for at least an hour to get everything up to temperature; check by shooting the oil filter
temperature with an IR temp gun until oil temperature has stabilised.
Change the oil and filter again and monitor
for say the next 50 hours.
Change the oil and filter and operate normally