Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-09-2012, 13:31   #1
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,745
Images: 9
Injector Pop Pressure

Hi All:

I have finally got around to pulling the injectors off of my Yanmar 4JH4E. It has been creating oil for a while now and I think that I may have found the answer. Two of the injectors have a pronounced drip. It may be possible that the diesel fuel is slipping by the rings and going into the lubricating oil.

The thing that is really throwing me is the pop pressure. I have 3 that are popping at around 2100 PSI and one that goes over 3000PSI w/o popping. The manual says that they should pop at 21.1 - 22.1 MPa or 215 - 225 kgf/cm^2. 21.1 MPa translates into 3060 psi. My pop tester only goes up to 3000 PSI. I imagine I could get a new gauge that would read higher (and would be more accurate). The spray pattern on all of them looks good and the fuel is atomizing nicely.

The engine seemed to be running fine. There is quite a bit of carbon build up on the tips so I am going to take them apart and soak them in carb cleaner but I was wondering if anyone knew whether I am misinterpreting the pop pressure.
__________________
Fair Winds,

Charlie

Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie is offline   Reply With Quote
Old 02-09-2012, 15:04   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,745
Images: 9
Re: Injector Pop Pressure

bump this is
__________________
Fair Winds,

Charlie

Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie is offline   Reply With Quote
Reply

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:54.


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.