1987 Johnson V4: Pressure at Crankcase Port to VRO Pump

Repair or modification of Boston Whaler boats, their engines, trailers, and gear
Post Reply
badcrank 707
Posts: 1
Joined: Wed Oct 23, 2019 1:04 pm

1987 Johnson V4: Pressure at Crankcase Port to VRO Pump

Postby badcrank 707 » Wed Oct 23, 2019 1:17 pm

Good Morning. What is an acceptable pulse pressure at the output crankcase pulse port [that drives the VRO oil mixing fuel pump] on a 1978 J110TLCUR Johnson outboard engine? At idle my engine has a pressure there of 3-PSI. Is that normal?
Top
L78steve
Posts: 22
Joined: Thu Aug 22, 2019 9:51 pm
Location: Hendersonville NC

Re: 1987 Johnson V4: Pressure at Crankcase Port to VRO Pump

Postby L78steve » Fri Oct 25, 2019 6:45 pm

That is more than enough to pulse the pump diaphragm. Be sure you have the blue colored pulse limiter installed 435009.
1988 15' Sport, 89 Johnson 70HP
1998 22' Progression Merc 300XP
1961 12' Allstar FG 73 Evinrude 25
Top
Post Reply

Return to “REPAIRS and MODIFICATIONS”