Hey all -
I have a new to me 4108, the ďnewĒ (Perkins language) model engine
with a Bowman combination header/exhaust manifold, a gear oil
cooler and a remote oil filter
Iíve had to do a good bit to the motor
already, the water
pump started leaking shortly after buying
; I pulled the hx core
and seawater pump
to renew, and found erosion damage and a pinhole in the hx tubestack sleeve as well as scale and indications that there was raw water
ingress into the coolant
side of the system (the hole in the tubestack being the primary indication, obviously). The new tubestack will be installed today or tomorrow.
The raw water pump
was found to be out of alignment with the drive shaft, it displayed deep scoring on the pumpshaft, a new jabsco pump
has been installed and the adapter plate removed and re-centered using the brass alignment tube. I have scrubbed and flushed the header tank through to the cylinder block drain with the hx core
removed, and will be running phosphoric acid through both sides of the system once its back together and I can more effectively flush and circulate fluids through the motor
(I canít find my crappy hand pump, so Iíve been siphoning through from the header tank to flush out debris in the coolant
lines using my mouth and a tube, itís super disgusting).
and filter were changed within 60 engine
hours from now, and the oil was just changed yesterday. Not very sludgy, but definitely dark. At the first change, I pumped oil through the dipstick, yesterday I pumped both through the oil pan access port as well as the dipstick. The oil pressure runs high very quickly ó I am not sure that it still does as I canít run the motor until I have the new hx core installed, but I have a suspicion that the issue is either a clog somewhere in the oil system, or a sticking oil pressure relief valve.
Itís my understanding that thereís little chance of access to the 4108 pressure relief valve as itís located in the oil pump. Is there anything I should do to further diagnose the high pressure source, or a good way to flush/clear the oil lines? I was planning on doing frequent t oil changes if the problem continues to appear, in an attempt to flush clean oil through the lines. If thereís anything obvious (or subtle) I might be missing, Iíd love to hear about it ó lots of help online with low oil pressure, but info on high oil pressure seems to be fairly scarce.
Iím by no means a diesel mechanic
, so anything that anyone might be able to suggest would be wildly helpful. Iím delivering my new boat
up the coast to the northeast and had to stop to remedy the cooling
issues. It would be very nice to get home.