Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 06-10-2022, 17:31   #1
Registered User

Join Date: Feb 2020
Posts: 163
Volvo MD2b engine injector rebuild/cleaning

My friend has a little Cacade with the Volvo MD2 which sadly got submerged, but they got it pumped out and changed the oil and then the fuel filters, and it is now fully bled and still refuses to start with fresh clean fuel.
I suspect the injectors are blocked because when it cranks there is not even a white puff of diesely smelling air. Id like to remove the injectors and clean and check them, and removal isnt hard but I see no details on how these little fuel injectors come apart.

Im going to do the test spray with WD40 into the intake and see if that makes it run, and Id appreciate any tips on how to tear down the injectors and inspect and clean them. (I broke down the Perkins injectors very easily and found its not hard at all to open and clean and inspect them, in spite of all the stern comments that they arent user servicable and it requires special tools. In the case of Perkins its just a large wrench!)

Thanks any Volvo guys!
doog is offline   Reply With Quote
Old 06-10-2022, 17:47   #2
Registered User

Join Date: Feb 2020
Posts: 163
Re: Volvo MD2b engine injector rebuild/cleaning

https://marinedieselbasics.com/wp-co...1-Workshop.pdf

OK found this on P 22/23 and its very do-able. Im on it! Id still appreciate any help!
doog is offline   Reply With Quote
Old 06-10-2022, 19:02   #3
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,550
Re: Volvo MD2b engine injector rebuild/cleaning

I’m totally not a Volvo guy but I’m genuinely interested to know by what process you arrived at the conclusion that the ”injectors are blocked”
Following[emoji848]
skipperpete is online now   Reply With Quote
Old 06-10-2022, 21:18   #4
Registered User

Join Date: Feb 2020
Posts: 163
Re: Volvo MD2b engine injector rebuild/cleaning

Happy to explain, we crank the engine for quite some time and it was spinning with good compression and good speed and normally you would get little puffs of compressed Fuel and Vapor out the exhaust that smells like diesel. All we got was dry air and water from the water injection. The exhaust as we crank the engine did not even smell like diesel fuel even though I know that it was thoroughly bled clear through to the bleed off tubes and there was good pressure in the fuel system. So do you see that's why I'm assuming the injectors were blocked from contamination in the fuel. Anyway I'm proceeding with the WD-40 spray which should make the engine attempt to run as long as it's sprayed. Then from there will pull the injectors and see if I can clean them. I'm fully expecting to find some sort of particulate blocking the nozzles.
doog is offline   Reply With Quote
Old 06-10-2022, 23:10   #5
Registered User
 
Ballsnall's Avatar

Join Date: Dec 2019
Posts: 514
Re: Volvo MD2b engine injector rebuild/cleaning

Quote:
Originally Posted by doog View Post
I'm assuming the injectors were blocked from contamination in the fuel.
Hard to see how the fuel would be contaminated?
At a guess I would suggest the injectors are not getting any fuel. Have you bled right to the injectors or just to the pump?
Ballsnall is offline   Reply With Quote
Old 06-10-2022, 23:26   #6
Registered User

Join Date: Feb 2020
Posts: 163
Re: Volvo MD2b engine injector rebuild/cleaning

"Fully bled" there were fuel issues.
doog is offline   Reply With Quote
Old 07-10-2022, 00:00   #7
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,550
Re: Volvo MD2b engine injector rebuild/cleaning

By “fully bled” do you mean you have fuel coming out of the the loosened injector pipe union at the injector?
skipperpete is online now   Reply With Quote
Old 07-10-2022, 01:25   #8
Registered User

Join Date: Dec 2021
Location: Montreal
Boat: Corbin 39 (CC Pilothouse Ketch)
Posts: 168
Re: Volvo MD2b engine injector rebuild/cleaning

+1 with skipperpete. Fuel needs to be bled to the injector supply union. Keep it simple.
Patrick of M is offline   Reply With Quote
Old 07-10-2022, 09:31   #9
Registered User

Join Date: Feb 2020
Posts: 163
Re: Volvo MD2b engine injector rebuild/cleaning

Thanks to Skipperpete and Patrick of M for sharing how to bleed the fuel system, I think my post was clear that Im very experienced at bleeding a fuel system and dont care to rehash those fundamentals. And for anyone unclear the fact is that its the bleed off line for the return fuel that should show high-pressure and bubble free fuel so you know, as I DID, THOROUGHLY, and then you know the system is totally air free. And so if the engine then will not fire its either got insufficient compression or not getting fuel.
Im going to do a WD40 shot and see if it will chug when this gets into the cylinders and someone suggested the little shut-off button can get stuck. I dont think it is but possibly so. It could have experienced corrosion as a result of submersion. Perhaps a solid rap on that little mechanism, but again if the shut-off button were stuck I dont think I'd be seeing fuel pressure at the return lines.
No evidence of water in the fuel but it did have a funky contamination and were using clean, fresh fuel drawn from a new container just filled.
doog is offline   Reply With Quote
Old 07-10-2022, 14:47   #10
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,550
Re: Volvo MD2b engine injector rebuild/cleaning

Quote:
Originally Posted by doog View Post
Thanks to Skipperpete and Patrick of M for sharing how to bleed the fuel system, I think my post was clear that Im very experienced at bleeding a fuel system and dont care to rehash those fundamentals. And for anyone unclear the fact is that its the bleed off line for the return fuel that should show high-pressure and bubble free fuel so you know, as I DID, THOROUGHLY, and then you know the system is totally air free. And so if the engine then will not fire its either got insufficient compression or not getting fuel.
Im going to do a WD40 shot and see if it will chug when this gets into the cylinders and someone suggested the little shut-off button can get stuck. I dont think it is but possibly so. It could have experienced corrosion as a result of submersion. Perhaps a solid rap on that little mechanism, but again if the shut-off button were stuck I dont think I'd be seeing fuel pressure at the return lines.
No evidence of water in the fuel but it did have a funky contamination and were using clean, fresh fuel drawn from a new container just filled.


No problem Doog, and thank you for sharing your knowledge, we all benefit from the information in your post.
Hope you get it running soon.
skipperpete is online now   Reply With Quote
Old 07-10-2022, 22:00   #11
Registered User
 
Searles's Avatar

Join Date: Feb 2020
Location: Port adelaide south australia
Boat: Cheoy lee perry 48
Posts: 756
Re: Volvo MD2b engine injector rebuild/cleaning

Sounds to me like the governor is sticking,and as this is spring loaded on these motors you can still move the control lever with out opening the governor ,also when trying to start be sure that the throttle lever is wide open .⛵️⚓️
Searles is offline   Reply With Quote
Old 07-10-2022, 23:41   #12
Registered User

Join Date: Dec 2021
Location: Montreal
Boat: Corbin 39 (CC Pilothouse Ketch)
Posts: 168
Re: Volvo MD2b engine injector rebuild/cleaning

I know you say you have bied it thoroughly, but just looking at the return will not mean you have fuel all the way. I have a MD17 which is a similar engine, with air in the system(no "back pressure from the injection pump) the lift pump pushes fuel out the return line, because of how the return line connects into the system. The return fuel doesn't recirculate back to before the pre lift pump like in a (more modern?) system. I agree with others here that it is probably the governor inside the injection pump hanging up, you might using ether/whatever to get it chugging, it may vibrate itself into working .
Lot's of information online on opening/cleaning/testing these easy to remove and service injectors, and if you have the time no harm in doing that.
I'm always a little skeptical of diagnosis that looks at multiple components failing concurrently (all injectors in your case) but as you have only 2 it is somewhat possible. A single point of failure (sticky governor in injection pump, seems more likely). Anyhoo, try cracking the intake line open at the injectors, that'll let you know if fuel is being delivered from the injection pump.
(Usual Warning: Watch out you don't inject yourself with fuel !!!)
Patrick of M is offline   Reply With Quote
Old 08-10-2022, 03:29   #13
Registered User
 
Ballsnall's Avatar

Join Date: Dec 2019
Posts: 514
Re: Volvo MD2b engine injector rebuild/cleaning

Quote:
Originally Posted by doog View Post
And for anyone unclear the fact is that its the bleed off line for the return fuel that should show high-pressure and bubble free fuel
I'm a bit confused by this, I've never see high pressure fuel in a return line before?
Ballsnall is offline   Reply With Quote
Old 08-10-2022, 05:06   #14
Registered User

Join Date: Dec 2021
Location: Montreal
Boat: Corbin 39 (CC Pilothouse Ketch)
Posts: 168
Re: Volvo MD2b engine injector rebuild/cleaning

Quote:
Originally Posted by Ballsnall View Post
I'm a bit confused by this, I've never see high pressure fuel in a return line before?
It's no to high pressure, just enough pressure to fool you if the injection pump isn't delivering fuel. i.e. if you crack the return you can see fuel coming out of the return port (backwards really) but no fuel could be coming out of the injection pump .
This is on a MD17, it has a healthy pre pump, doesn't depend on the injection pump suction for fuel delivery to injection pump.(kind of like modern common rail, where an in tank low pressure pump delivers fuel to the HP pump which delivers HP fuel to the common rail).
Patrick of M is offline   Reply With Quote
Old 08-10-2022, 16:59   #15
Registered User
 
Ballsnall's Avatar

Join Date: Dec 2019
Posts: 514
Re: Volvo MD2b engine injector rebuild/cleaning

OK, so no high pressure on the return side Just never heard of bleeding the return line before, is this a thing now?
Ballsnall is offline   Reply With Quote
Reply

Tags
cleaning, engine, md2b, rebuild, volvo

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
For Sale: Volvo Penta MD2B for rebuild or parts TJSocal General Classifieds (no boats) 0 10-08-2021 09:25
Help need a Volvo MD 7A Volvo injector top. SV Cygnus Monohull Sailboats 0 10-09-2017 21:51
Volvo MD2B and Volvo 2030 svmersea Engines and Propulsion Systems 1 29-01-2015 19:20
For Sale: Volvo Penta MD2B Diesel Engine Aleks Classifieds Archive 1 06-07-2013 06:22
Volvo MD2b engine anode? Zendoc Engines and Propulsion Systems 1 07-01-2007 06:35

Advertise Here


All times are GMT -7. The time now is 01:45.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.