Offshoreonly.com

Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   Drives and Lower Units (https://www.offshoreonly.com/forums/drives-lower-units-217/)
-   -   3800 rpm wall (https://www.offshoreonly.com/forums/drives-lower-units/304342-3800-rpm-wall.html)

Toolman62 10-18-2013 10:18 AM


Originally Posted by phragle (Post 4013642)
try cleaning the filter on the hi pressure pump in the VST tank.

OK I'll look at that when I do the vaccum test on the fuel line

Knot 4 Me 10-18-2013 10:42 AM

Not aware of a VST tank on a 7.4L MPI.

pstorti 10-18-2013 10:55 AM

maybe its a diesel! :)

Toolman62 10-18-2013 10:57 AM

Then I'll just look for ANY and all filters and ck or replace them

Toolman62 10-18-2013 12:15 PM

Just got my leak down results back and something is going on. 80% on #1 and 60% on #8. we stopped with that. I may be looking at a refresh and seeing what will happen after that.

wannabe 10-18-2013 02:55 PM

You have a cylinder down, maybe more than one.

Pull the heads. Check plugs first.

Wannabe

Toolman62 10-18-2013 05:07 PM


Originally Posted by wannabe (Post 4013790)
You have a cylinder down, maybe more than one.

Pull the heads. Check plugs first.

Wannabe

Already pulled the plugs, they looked really good all the way to the bottom of the ceramic. Going to pull engine and go through it or drop in a 502 so it will be tip top for next spring. Our season has ended here in KY anyway.

92nsx 10-18-2013 05:18 PM


Originally Posted by Toolman62 (Post 4013706)
Just got my leak down results back and something is going on. 80% on #1 and 60% on #8. we stopped with that. I may be looking at a refresh and seeing what will happen after that.

80% leak down!!!!!!!!! 60% leak down!!!!!!!!!!!!!!!!!:eekdrop::eekdrop::eekdrop: Didn't you smell raw gas with the captains call on? No way #1 could even fire.

Im surprised you even got 3800 rpm. Sounds like a engine rebuild to me. Maybe you can get lucky and just have a couple stuck/burnt valves and just do a top end.

Toolman62 10-18-2013 05:24 PM

That's what I'm hoping for is valve train, but I am prepared for the worst

johnnyboatman 10-18-2013 09:10 PM

limp mode.


All times are GMT -5. The time now is 03:47 PM.


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.