Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-06-2014, 21:13   #1
Registered User
 
Liber's Avatar

Join Date: Oct 2011
Location: France
Boat: 1985 aluminium sailboat, 43ft
Posts: 18
Perkins 4108 oil pressure drop

Hello Everyone,

My 4108 runs perfectly, does not overheat, no smoke out the back. However, literally from one day to the other the oil pressure dropped from 3,4 to 3 bar (same operating conditions, oil level ok). This is still within the recomended operating range but what concerns me is the sudden drop from one day to the other. Is it a faulty gauge or is it a bigger problem (oil pump...) linked with the engine?. If it is the engine what are the probable causes?
Thank your for your advice,
Cyril
__________________

__________________
Liber is offline   Reply With Quote
Old 09-06-2014, 21:32   #2
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: Perkins 4108 oil pressure drop

Have you done anything? Oil change, etc? If not check that you don't have diesel mixed with your lube oil. Could be a seal in the HP pump or leak in the lift pump if you do.
__________________

__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 09-06-2014, 21:40   #3
Registered User
 
Liber's Avatar

Join Date: Oct 2011
Location: France
Boat: 1985 aluminium sailboat, 43ft
Posts: 18
Re: Perkins 4108 oil pressure drop

No, nothing changed., I arrived in port and left the next morning. i looked at the oil dipstick to check the oil level (which was ok) and did not see any signs of diesel being present, is there another way to check?
Thanks
__________________
Liber is offline   Reply With Quote
Old 09-06-2014, 21:46   #4
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: Perkins 4108 oil pressure drop

If there was enough diesel to affect your oil pressure reading you would be able to smell it on the dipstick or feel it when rubbed between thumb and finger tip. I would just keep a close eye on things and if it drops again check your oil pressure sender and pressure gauge first if you see no rise in oil level.
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 09-06-2014, 21:48   #5
Registered User
 
Liber's Avatar

Join Date: Oct 2011
Location: France
Boat: 1985 aluminium sailboat, 43ft
Posts: 18
Re: Perkins 4108 oil pressure drop

Ok thanks
__________________
Liber is offline   Reply With Quote
Old 09-06-2014, 22:06   #6
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Re: Perkins 4108 oil pressure drop

The oil pressure relief valve would do that. I'm surprised they last as long as they do, kind of like our heart valves. Wow.
__________________
Guy is offline   Reply With Quote
Old 09-06-2014, 22:14   #7
Registered User
 
Liber's Avatar

Join Date: Oct 2011
Location: France
Boat: 1985 aluminium sailboat, 43ft
Posts: 18
Re: Perkins 4108 oil pressure drop

Guy, if that is the case does it need replacement or do I leave it as it is since the pressure is within specs? Can it get worse and cause total oil pressure loss?
Thanks
__________________
Liber is offline   Reply With Quote
Old 09-06-2014, 22:42   #8
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Re: Perkins 4108 oil pressure drop

I'm not sure there is any way to know. It would be worse when the oil is hot. I've seen an rebuilt engine go from good oil psi cold, to lousy when hot because of a leaking valve seat. Of course it could leak cold also. Nothing else inside the engine could be intermittent unless you are in the process of spinning a bearing. If you are, you will soon know.
__________________

__________________
Guy is offline   Reply With Quote
Reply

Tags
oil, perkins

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
4-108 Oil Pressure Drop After Oil Change. phorvati Engines and Propulsion Systems 50 07-10-2012 03:43
Oil Cooler hookup on Perkins 4108 Trekka Engines and Propulsion Systems 6 13-01-2009 19:48
Oil change causes oil pressure change. theonecalledtom Engines and Propulsion Systems 9 16-06-2008 15:10



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:53.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.