Reply
 
Thread Tools Display Modes
 
Old 10-29-2007, 09:32 PM   #1
Member
 
Join Date: Oct 2007
Posts: 7
Lehman Oil Pressure

Need some advice from you Lehman gurus:*

I have two SP135's with about 6300 hrs on them. Port engine oil pressure is 20 psi at 1500 rpm, starboard is 30 psi--both read at the engine mounted gage.

Engines run fine, don't use much oil, very little smoke at startup, and water temps are normal.

Is the low oil pressure a problem?
__________________
Advertisement

GeorgeW is offline   Reply With Quote
Old 10-30-2007, 02:26 AM   #2
Senior Member
 
Join Date: Oct 2007
Posts: 272
RE: Lehman Oil Pressure

I have twin 80 hp Lehmans, I normally see about 40 psi.*Do your upper and lower helm instruments read the same?*
__________________

troy994719 is offline   Reply With Quote
Old 10-30-2007, 04:48 AM   #3
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,530
Lehman Oil Pressure

"Is the low oil pressure a problem?"

No way to know with out replacing the gage with a QUALITY mechanical gage AT the engine.

S-W has fine 270deg sweep gages that will tell the tale for about $50.

Temporarily install the gage , chart the oil pressure at start with cold oil and then again at various RPM's underway. The warm , cold difference is valuable information

A set of shooters head gear makes the Hell Hole more comfortable for the min spent reading the gage.
Electric "remote" gages are really only fancy IDIOT lights , not very accurate .

For accurate remote gages get Murphy Gages , which are mechanical.

When you have the numbers call Bob Smith , he may need to send you a crank , and rod bearing set.
FF is online now   Reply With Quote
Old 10-31-2007, 08:06 AM   #4
Member
 
Join Date: Oct 2007
Posts: 7
RE: Lehman Oil Pressure

Pressure is being measured by gauges at the engine--remote gauges agree with engine gauges. Had a mech check it and he verified 20 psi on one and 30 on the other, said they should both be 40 at idle although my operating manual says minimum of 30 psi.

He said problem could range from pressure regulator valves to weak oil pumps to major bearing wear. (Minor $$ to unlimited $$)

Oil is off to analysis--I'll keep you posted.

Thanks for the advice!

-- Edited by GeorgeW at 09:07, 2007-10-31
GeorgeW is offline   Reply With Quote
Old 11-01-2007, 10:18 PM   #5
Senior Member
 
Brent Hodges's Avatar
 
City: Seabrook, Texas
Country: USA
Vessel Name: Friendship
Vessel Model: Albin 43 Sundeck
Join Date: Oct 2007
Posts: 138
Lehman Oil Pressure

I installed mechanical gauges on my SP135's a couple of years ago just because i didn't trust the electric gauges. The good mechanical gauges on the engines both read about 45lbs at idle and 65 at 1800 rpm. The engines have about 2100 hours on them. Just for comparison.
Brent Hodges is offline   Reply With Quote
Old 11-07-2007, 09:18 PM   #6
Newbie
 
Join Date: Nov 2007
Posts: 2
RE: Lehman Oil Pressure

I also have 135's with ~3000 hours.* They have 50 and 55 psi at 1900 rpm measured by mechanical gauges.
Seaquel is offline   Reply With Quote
Old 11-08-2007, 01:55 PM   #7
Member
 
Join Date: Oct 2007
Posts: 7
Lehman Oil Pressure

Thanks for the input, guys. Still awaiting analysis results. Meanwhile taking medical merlot to keep the nightmares under control!
GeorgeW is offline   Reply With Quote
Old 11-08-2007, 06:26 PM   #8
Newbie
 
Join Date: Nov 2007
Posts: 2
RE: Lehman Oil Pressure

I also have 135's with ~3000 hours.* They have 50 and 55 psi at 1900 rpm measured by mechanical gauges.
Seaquel is offline   Reply With Quote
Old 11-08-2007, 11:51 PM   #9
Veteran Member
 
Gene's Avatar
 
Join Date: Oct 2007
Posts: 82
RE: Lehman Oil Pressure

Is there an echo in here?*
Gene is offline   Reply With Quote
Old 11-22-2007, 06:55 AM   #10
Member
 
Join Date: Oct 2007
Posts: 7
RE: Lehman Oil Pressure

Well, the verdict is in: nothing at all wrong with my 6300 hr Lehman 135SP's.
New oil pressure sensors properly*installed show 45-50 psi at the engines. A slight difference on pilothouse gauges but they're as old as the boat.*The oil analysis was clean.
*
Thanks to all for your help, and Happy Thanksgiving!
__________________

GeorgeW is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil Pressure Guages Dixie Life Power Systems 4 11-29-2011 06:54 AM
High Oil Pressure? mc14 Power Systems 1 09-13-2011 04:32 AM
Need help with oil pressure gauge Fotoman Power Systems 13 07-06-2011 11:44 AM
Ford Lehman 120 Oil Pressure patzfan4eva Electrical and Electronics & Navigation 4 02-17-2011 06:27 AM
6.354 oil pressure drop/ oil weight JMYSS Power Systems 11 09-21-2010 04:05 AM




All times are GMT -5. The time now is 06:11 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012