Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 14-01-2022, 20:00   #1
YKE
Registered User

Join Date: Feb 2013
Posts: 19
losing engine oil - VP D2-75

Hi All, happy new year.

want to benefit from the collective wisdom of CF members.

My engine, VP D2-75, has been leaking and losing oil since I bought boat in 2019.

Yes, Silly me I did not get a separate engine survey done.. thought it would be coved by surveyor I employed fm UK at great expense, boat was in Italy.

So, Last euro winter the engine came out and serviced externally, changing all seals, incl water pump, exhaust elbow, reconditioning of turbo, etc. We did not open and touched the pistons, etc. 6k euro latter it was put back early in the season and we had full euro season with it.

But it’s still losing oil, we topped it up at least twice with around 2 lt in 150 hrs for the full season. No leak in the engine room and no black smoke in the exhaust, etc.

Local technicians are struggling to understand the reason, as compression test was good at 19, oil test also was ok, but given we toped it up with new oil it was not 100 % conclusive.

Where is the bloody oil going ?

Any ideas, experiences and recommendations to find the reason for oil loss??

Appreciate your advise and thoughts.

rgds, yke
YKE is offline   Reply With Quote
Old 14-01-2022, 21:11   #2
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 14,506
Re: losing engine oil - VP D2-75

If the oil isn't visibly leaking externally, then it must be going out the exhaust (in the exhaust gas or raw water) or into the coolant. It is highly unlikely to be in the coolant or exhaust water as you would soon notice either of these loss paths. Therefore most likely to going out in the exhaust gas - in other words, getting burnt.

Burning oil usually gives blue smoke in the exhaust, not black. Black is usually running rich (i.e. overfilled). Perhaps it is light blue enough not to notice.

You say "compression test was good at 19", what does the '19' refer to?
If it means 1.9MPa, that is awfully low IMO. The service book number is 2.95MPa (428psi) at 240 rpm.

I'm not familiar with the VP D2-75 but I would look deeper into the compression test numbers because right now it seems the oil is getting past the rings and the reported compression numbers are too low.

BTW, is this the turbo model and does it start promptly when cold?

See http://www.darthaven.co.uk/userfiles...ta%20D2-75.pdf
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is online now   Reply With Quote
Old 15-01-2022, 00:16   #3
Senior Cruiser

Cruisers Forum Supporter

Join Date: May 2013
Location: Oregon to Alaska
Boat: Wheeler Shipyard 83' ex USCG
Posts: 3,254
Re: losing engine oil - VP D2-75

If the engine is burning oil, there should be a oil sheen on the water. If you have an oil cooler, you could have a leak in the heat exchanger, but you'd also have a oil sheen. Although 2 liters in 150 hours isn't much of a leak and may only leak when the oil is hot. A pin hole leak in the oil cooler, when the oil is cold, often doesn't leak until the oil is thinned.

If 19 means 1.9 mpa, and I did the math right, it's ok.
I'd pressure test the oil cooler.
Lepke is offline   Reply With Quote
Old 15-01-2022, 00:32   #4
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 14,506
Re: losing engine oil - VP D2-75

Quote:
Originally Posted by Lepke View Post
........
If 19 means 1.9 mpa, and I did the math right, it's ok.
I'd pressure test the oil cooler.
I dunno what maths you did but 1.9 map (or 19 bar) is 276 psi. The D2-75 has a compression ratio of 23.3. The manufacturer's compression spec for the engine is 428 psi.

So this indicates a decline of 152 psi or 35%.

Now I accept you know a LOT more about diesel engines than me but that seems way too much considering the reported fault of oil consumption.

But yes, pressure testing the oil cooler is sound idea.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is online now   Reply With Quote
Old 15-01-2022, 00:56   #5
Marine Service Provider

Join Date: Jun 2015
Location: Croatia
Boat: bavaria 38
Posts: 894
Re: losing engine oil - VP D2-75

Quote:
Originally Posted by YKE View Post


So, Last euro winter the engine came out and serviced externally, changing all seals, incl water pump, exhaust elbow, reconditioning of turbo, etc. We did not open and touched the pistons, etc. 6k euro latter it was put back early in the season and we had full euro season with it.


Where is the bloody oil going ?

Any ideas, experiences and recommendations to find the reason for oil loss??
first all data please
year of production yours perkins 404d-22T (engine block 3000€)
total number hours working
usually rpm you and other sail.
do you usually sail over 2300 rpm or under

this engine don't touch fuel injector,engine block,piston,valve
and you are from UK(i think) be in contact with this guy

Volvo Penta NEW D2-75 72hp Marine Diesel Engine & 150S Saildrive Package new 10251 pound
Dorset, South West England, UNITED KINGDOM
https://marineenterprises.co.uk

always you can sell your engine and buy new maybe for 6000€ difference (hahaha)
more is offline   Reply With Quote
Old 15-01-2022, 11:05   #6
Registered User
 
Chayal's Avatar

Join Date: Sep 2019
Location: Vancouver
Boat: Samson C-shell 36
Posts: 134
Re: losing engine oil - VP D2-75

OP I’m curious how the compression test was done on your engine. Was the engine warmed up?

19 bar is low compression. 25 bar Is minimum.
Chayal is offline   Reply With Quote
Old 16-01-2022, 02:29   #7
Registered User
 
Searles's Avatar

Join Date: Feb 2020
Location: Port adelaide south australia
Boat: Cheoy lee perry 48
Posts: 384
Re: losing engine oil - VP D2-75

If this engine has valve guide seals that’s the first place I would check ,plus check for blow by on the piston rings,all these checks are easy enough to do .⛵️⚓️
Searles is offline   Reply With Quote
Old 16-01-2022, 12:01   #8
Registered User

Join Date: Apr 2013
Location: Cruising the west coast
Boat: Fraser 42 ft Center cockpit sloop
Posts: 51
Re: losing engine oil - VP D2-75

I've worked on boat engines most of my life and consider 2 liters of oil burn to not be excessive. Look in the cylinders if you want and check the cross hatch in the cylinder walls. Could be the honing wasn't sufficient. I wouldn't worry about it. I
I once motored a boat from Seward Alaska to Bellingham Washington that burned a quart of 40 weight oil every three hours. Cheers. John
Hyrdflyr is offline   Reply With Quote
Old 16-01-2022, 17:59   #9
Marine Service Provider

Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,705
Re: losing engine oil - VP D2-75

Personally I would ignore 2lt consumption in 150hrs if its not smoking or putting oil in the bilge. You can buy a lotta oil for 6k Euro. I dont know whats normal for that engine. However if you are used to Japanese engines I can see why you would find it annoying.
Doubt if a surveyor would have picked up the problem with no smoke & no leaks.
Compass790 is offline   Reply With Quote
Old 17-01-2022, 20:01   #10
Registered User

Join Date: Nov 2014
Posts: 1,388
Re: losing engine oil - VP D2-75

Unlikely to be going out the oil cooler, as the oil cooler is on the fresh water side. The oil would have to show up in the coolant.

My guess would be the turbo seals......you said the turbo was “reconditioned”....what does that mean?

If you constantly run the engine at low revs, before the turbo develops any boost, you will have vacuum in the inlet tract instead of boost pressure, and that can pull oil past the turbo seals. Suggest you check beneath the aftercooler drain hole and see if you have oil drip on the flywheel housing. (You will always have some drainage here, just a question of how much)

As some have stated, one liter in 75 hours isn’t too bad....depends on total hours.
DougR is offline   Reply With Quote
Old 17-01-2022, 20:04   #11
Registered User
 
Chayal's Avatar

Join Date: Sep 2019
Location: Vancouver
Boat: Samson C-shell 36
Posts: 134
Re: losing engine oil - VP D2-75

1L/75h I’d run it too without hesitation.
Chayal is offline   Reply With Quote
Old 27-04-2022, 08:19   #12
Registered User
 
Pillard's Avatar

Join Date: Nov 2021
Location: Evergreen, CO USA
Boat: 2002 42’ Leopard
Posts: 8
Re: losing engine oil - VP D2-75

Was a culprit ever positively identified?
__________________
Pillard
“Builder of Weird Stuff”
2002 42’ Leopard ‘Outlander’
Pillard is offline   Reply With Quote
Reply

Tags
engine, oil

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Losing Oil Pressure? ggray Engines and Propulsion Systems 8 31-05-2020 18:41
Yanmar 4JH4 Losing Oil straitscrew Engines and Propulsion Systems 0 01-06-2012 05:03
Saildrive Losing Oil Cruisin Cat Propellers & Drive Systems 2 02-11-2011 08:37

Advertise Here


All times are GMT -7. The time now is 20:08.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.