Universal M25 losing power

[Maine Sail]

Originally Posted by Capt. Gary Randall

idle RPM should be 550 to 600 apparently you posted this right before I posted to you...lol

No it should not. That is HALF what the idle RPM on an M-25 should be.

The entire Universal M-25 line up, including the M-25, M-25XP and M-25-XPB are all 1000-1200 RPM for idle speed, per Westerbeke specifications.

[weinie]

Originally Posted by Maine Sail

No it should not. That is HALF what the idle RPM on an M-25 should be.

The entire Universal M-25 line up, including the M-25, M-25XP and M-25-XPB are all 1000-1200 RPM for idle speed, per Westerbeke specifications.

Maine,

What about the 2 cylinder M18 engine? I have not been able to find any documentation anywhere specifying the correct idle speed! I was hoping you might know.

[eherlihy]

So today I removed and replaced the fuel pump filter with a NAPA 610-1086 ($18 with shipping, 'cause I didn't want to drive 20 miles to NAPA).

I would like to express my thanks to Stu Jackson, because I never knew there was a fuel pump filter, and to Maine Sail, for his excellent write up of how to replace the Facet Fuel Pump Filter (here).

Here is what my (original?) Facet fuel pump filter and gasket looked like;


It wasn't terrible, but you can see a good deal of "stuff" that had been filtered out. I actually tried to take a picture of the worst side of the filter. The other side was relatively clean. Note that I have not changed the fuel lines yet. Therefore the fuel pump is the first stop after the fuel tank petcock. The next stop is the Raycor. Next year I'll change that.

There was no evidence of corrosion on the bottom of the filter, so I would guess that my tank is relatively free of H2O. I was surprised by the amount of gunk in the filter housing, and, what appeared to be sawdust(?!) trapped in the filter housing. The gasket looked to be in good condition, so I wiped the gunk off, and will keep it as a spare.

Also note that the black button in the center of the bottom cover is actually a magnet. I believe that this is installed in the filter assembly to attract metal particles, should they penetrate the filter.

RE: weinie's post above - I believe that ALL of these Universal engines should have the idle set to 1000.

[Paladin]

Have you had the injectors pop tested? Are they up to spec pressure? Pattern right? How much oil pressure does your engine hold? Govenor on injection pump deviates if engine oil pressure low due to fact engine oil pressure directly influences injection pump govenor, I.E. injection pump govenor is oil pressure throttled under load.

[Maine Sail]

Originally Posted by weinie

Maine,

What about the 2 cylinder M18 engine? I have not been able to find any documentation anywhere specifying the correct idle speed! I was hoping you might know.

Per Joe Joyce at Westerbeke:

The 2 & 3 cylinder Universals are 1000 - 1200 Idle RPM
The 4 Cylinder Universals are 800 - 1000 Idle RPM

[eherlihy]

Thus my answer of 1000 which covers them all