Volvo Penta MD22L injector nozzle replacements

[Heckler]

I am posting this here for reference if any one needs the info about their injectors in the above engine. It took me weeks to collate everything.
I have one of these engines in my boat and have started to get a slight misfire and smoky (more than normal) startup so I decided to have a look at the injectors. The model of the engine is an MD22L B with the injector pipe screwing downwards on to the injector.
The injector body number is KBEL 68P 40 and is set at 225 bar. I dismantled one and the nozzle number is DLLA 150P 159 and Bosch number 0433171142.
It was coked up as they are after 3250 hours!
I searched for some on the net and found some! I had to buy 12 to get a deal! They are brand new genuine Bosch, and sealed in their sale tubes.
They are easy enough to change if you are handy with tools. The local diesel man said that because they are set with shims they should be a straight swop. I will get mine checked on a pressure rig however.
So to any owners of an MD22L, if you want a set of 4 genuine nozzles for your Bosch injectors I have put two sets up for sale in the for sale section at the right price.

 

[RichardS]

Stu .... could I just ask whether you tried a good quality injector cleaner fuel additive before you decided that the injectors needed to come out?

I've twice been faced with similar symptoms with car diesel engines and both times a concentrated shot of cleaner has sorted out the problem without any further action on my part. I've never had any problems with my boat engines which both have 3500 hours but I run them through with cleaner as a preventative measure every other tankful.

PS .... liking the new avatar.

Richard

 

[peteK]

Same here but I didnt put it in the tank I ran it neat from the can.worked a treat.

 

[Heckler]

Stu .... could I just ask whether you tried a good quality injector cleaner fuel additive before you decided that the injectors needed to come out?

I've twice been faced with similar symptoms with car diesel engines and both times a concentrated shot of cleaner has sorted out the problem without any further action on my part. I've never had any problems with my boat engines which both have 3500 hours but I run them through with cleaner as a preventative measure every other tankful.

PS .... liking the new avatar.

Richard

I had thought about it, running from a jug of diesel with the juice in but finding stuff that I trusted in Portugal? As it happens the first one I pulled, the nozzle needle had a rough patch on it and is sticking I think. The ones I found are easy enough to do and will make a good article!

 

[Heckler]

I had thought about it, running from a jug of diesel with the juice in but finding stuff that I trusted in Portugal? As it happens the first one I pulled, the nozzle needle had a rough patch on it and is sticking I think. The ones I found are easy enough to do and will make a good article!

PS I put the usual suspects on ignore so cant see what they are saying about me and the avatar, suspect it wont be nice!

 

[MAURICE]

I would like to see how the injectors are removed and replaced. i thought they needed special tools?

 

[peter gibbs]

I bought my Bav 38 new, with its 4 pot Perkins block engine. Since then (20 seasons) I have occasionally fretted over the injectors, thinking like a petrol head. All advice - leave alone, use some cleaner by all means. Smoke on startup is not a signal for replacing the injectors, running the engine really hot under load will perform a lot of the cleaning action; some cleaner gunk will not go amiss - I use it now.

But you've made that decision. Sealing the new injectors against leaking from the water jacket is a matter for close attention on my engine - another reason I am advised to leave it alone. Yours?

In terms of burn efficiency, most of us use nothing like enough fuel each season to worry here.

However, it is also true that obvious and persistent signs of unburnt fuel when under way and engine is warm - ie thick smoke - is a cause for action. Is this your situation?

Best,

PWG

 

[Heckler]

I bought my Bav 38 new, with its 4 pot Perkins block engine. Since then (20 seasons) I have occasionally fretted over the injectors, thinking like a petrol head. All advice - leave alone, use some cleaner by all means. Smoke on startup is not a signal for replacing the injectors, running the engine really hot under load will perform a lot of the cleaning action; some cleaner gunk will not go amiss - I use it now.

But you've made that decision. Sealing the new injectors against leaking from the water jacket is a matter for close attention on my engine - another reason I am advised to leave it alone. Yours?

In terms of burn efficiency, most of us use nothing like enough fuel each season to worry here.

However, it is also true that obvious and persistent signs of unburnt fuel when under way and engine is warm - ie thick smoke - is a cause for action. Is this your situation?

Best,

PWG

Answer to two, the prime reason for messing with them is a slight misfire on start from cold and a slight vibration. As it happens the first one I pulled had a wear spot on the side of the nozzle needle. They are not like the 2000 series, they sit on a copper washer in the aluminium head with no connection to the coolant. They are held in place by a set if sprung forks and one bolt bearing on two flats on the injector. To remove loosen the bolt and carefully lift the forks as it is undone. Then put a spanner on the flats and wriggle it out. I have made a tube puller to use if they are tight! To remove the nozzles, a 15mm socket on the nozzle nut and a breaker bar, they are tight! and a big movie wrench on the flats to hold the body. A clean bowl of diesel and a brass suede brush to get carbon off. Then slip in the new nozzle, spring and shims, tighten and it will be somewhere near. I used to do this as a young diesel fitter working on rolls royce and ford diesels.

 

[Heckler]

I would like to see how the injectors are removed and replaced. i thought they needed special tools?

Am doing an article for consideration by PBO