Injectors

[dj43]

Hi all
Our engines have now passed eight hundred hours ,not sure the present no as they have decided not to tell me , normal problem gone blank, engine Manual says get them checked at two thousand hrs ,spoke to volvo dealer they recommend service around the one thousand hrs,other engineers have questioned why am I contemplating taking them out, as they have have been running fine with no noticeable problems ,but as they are now thirteen years old, have decided to pop them out and get them checked out, the question is am I wasting my time and money or is this good preventative maintenance,
Should add that I have now removed them as they all came out ok.

 

[Geoffs]

Hi all
Our engines have now passed eight hundred hours ,not sure the present no as they have decided not to tell me , normal problem gone blank, engine Manuel says get them checked at two thousand hrs ,spoke to volvo dealer they recommend service around the one thousand hrs,other engineers have questioned why am I contemplating taking them out, as they have have been running fine with no noticeable problems ,but as they are now thirteen years old, have decided to pop them out and get them checked out, the question is am I wasting my time and money or is this good preventative maintenance,
Should add that I have now removed them as they all came out ok.

Mine done nearly a thousand, 970, to be precise. I'm leaving well enough alone. Engine runs as sweet as a nut,no smoke or anything else.

I know this is often mis quoted, but ' if it ain't broke, don't fix it!'.

 

[Latestarter1]

Hi all
Our engines have now passed eight hundred hours ,not sure the present no as they have decided not to tell me , normal problem gone blank, engine Manuel says get them checked at two thousand hrs ,spoke to volvo dealer they recommend service around the one thousand hrs,other engineers have questioned why am I contemplating taking them out, as they have have been running fine with no noticeable problems ,but as they are now thirteen years old, have decided to pop them out and get them checked out, the question is am I wasting my time and money or is this good preventative maintenance,
Should add that I have now removed them as they all came out ok.

Before I step into the mire of Green Engines what model? I know MAN has very short injector check out period and aware some VP models, but 1,000 hours??

Can Volvopaul help me to understand why........

 

[Jonmendez]

When we pulled ours at 3600 hours Volvo AD41's one needed a tidy up rest were spot on, since they are pulled already it is possibly worth a check, personally I would give them a good look over, if all the same then just put them back in!!

 

[volvopaul]

Before I step into the mire of Green Engines what model? I know MAN has very short injector check out period and aware some VP models, but 1,000 hours??

Can Volvopaul help me to understand why........

I cannot give a real answer that would make sense to someone as knowledgeable as LS .

All I can say is that in a Volvo they don't like sitting idle for long periods , I've seen many sets tested before my eyes in the pump shop . I've seen the low pressures , bad spray pattern and dribble.
I've often wondered myself this question , took a set last week to Bosch shop all under pressure so new nozzles advised because they said it gives 100% job renewed instead of ultrasonic clean up and then still having to shimm up to get correct opening pressure which is of course labour= more money.
Maybe this is a pump shop thing which gives the best result all round.
Also all marine application motors seem to have higher opening pressures than standard automotive application , which makes me wonder the units wear out quicker.

 

[Danbury]

Hi all
Our engines have now passed eight hundred hours ,not sure the present no as they have decided not to tell me , normal problem gone blank, engine Manuel says get them checked at two thousand hrs ,spoke to volvo dealer they recommend service around the one thousand hrs,other engineers have questioned why am I contemplating taking them out, as they have have been running fine with no noticeable problems ,but as they are now thirteen years old, have decided to pop them out and get them checked out, the question is am I wasting my time and money or is this good preventative maintenance,
Should add that I have now removed them as they all came out ok.

Who's Manuel ? Does he know alot about engines ?

 

[volvopaul]

Hi all
Our engines have now passed eight hundred hours ,not sure the present no as they have decided not to tell me , normal problem gone blank, engine Manuel says get them checked at two thousand hrs ,spoke to volvo dealer they recommend service around the one thousand hrs,other engineers have questioned why am I contemplating taking them out, as they have have been running fine with no noticeable problems ,but as they are now thirteen years old, have decided to pop them out and get them checked out, the question is am I wasting my time and money or is this good preventative maintenance,
Should add that I have now removed them as they all came out ok.

What motors do you have ? I'm guessing TAMD 122PEDC? If so I'd say your right to at least have them tested if nothing else, bad spray pattern and hosing is a route to blown pistons.

Colchester fuel injection is in your area, or MB fuel in Southampton.

 

[dj43]

Thanks for reply,s

Late starter 1 Engines are Volvo penta TAMD 122 P-b 610,
Jon They all look ok, but I would not no the difference
Thanks Paul even if they test out ok, it will be worth it, what got me worried was a post on another forum where a faulty injector led to an engine rebuild,

 

[tinkicker0]

I cannot give a real answer that would make sense to someone as knowledgeable as LS .

All I can say is that in a Volvo they don't like sitting idle for long periods , I've seen many sets tested before my eyes in the pump shop . I've seen the low pressures , bad spray pattern and dribble.
I've often wondered myself this question , took a set last week to Bosch shop all under pressure so new nozzles advised because they said it gives 100% job renewed instead of ultrasonic clean up and then still having to shimm up to get correct opening pressure which is of course labour= more money.
Maybe this is a pump shop thing which gives the best result all round.
Also all marine application motors seem to have higher opening pressures than standard automotive application , which makes me wonder the units wear out quicker.

Don't they sell jeweller's rouge anymore?

 

[superheat6k]

Not on your route, but Poole Diesel tested mine from the TND40 on my last boat for a fiver around 3 years ago. To test only only tales a few minutes, so see if you can find a friendly truck diesel specialist well away from the coast.

 

[A_8]

Not sure this is relevant to your engines but changed mine (KAD43) at around 1000h and the most noticeable difference was a lower and smoother run at idle rpm, it had been slowly creeping up over the last years and varying more than usual between short runs and longer ones. The second was less vibration at +3400 rpm's, maybe a bit less smoke.

 

[dj43]

Who's Manuel ? Does he know alot about engines ?

Hi
Volvo Penta instruction book,came with boat and there maintenance scheme,
Do I no a lot about engines no, engineer was a friends ,who was asked on my behalf ,hence my confusion and post.

 

[dj43]

Not sure this is relevant to your engines but changed mine (KAD43) at around 1000h and the most noticeable difference was a lower and smoother run at idle rpm, it had been slowly creeping up over the last years and varying more than usual between short runs and longer ones. The second was less vibration at +3400 rpm's, maybe a bit less smoke.

That's interesting as had to adjust idling speed, from 750rpm down to 550rpm ,made for interesting manovering in tight spots,with the occasional refusal to engage neutral and reverse

 

[volvopaul]

That's interesting as had to adjust idling speed, from 750rpm down to 550rpm ,made for interesting manovering in tight spots,with the occasional refusal to engage neutral and reverse

That's the damper on the pump that requires adjusting .

 

[dj43]

That's the damper on the pump that requires adjusting .

Hi Paul
Adjusted idle speed on master EDC control, as both engines were the same, 750rpm, was this not correct

 

[Latestarter1]

Prior to the introduction of common rail I was part of a major study into long term durability of PLI (Pump Line Injector) system. Other than Volvo Penta and some MAN models most manufacturer had no service schedule for injectors. No technical reason at all why closed nozzle injectors should require regular pop testing and I cannot understand cases at low breaking pressure at low such few hours. The only reason for injector to hose will be due to debris or more likely water contamination.

Plenty of cases of Volvo 60's and 70's in industrial applications doing 15,000 hours plus with no recommended injector change out.

If common rail injectors had only 2,000 hour durability on field trials the concept would have been stillborn.

 

[tinkicker0]

Not being a marine man, is cherry diesel still high sulphur? Maybe they worry about build up on the needle seat?

 

[Latestarter1]

Called Volvo and have the answer at last.

Older VP marine engines with PLI injection systems employed a low compression combustion strategy. A side effect of VP combustion strategy is that injector nozzles run very cold causing internal carbon build up, which in term causes disrupted spray pattern and bore washing, leading to bore glazing at relatively low hours.

OP's concern was a valid one and 1,000 hour advice from VP dealer was sound.

Always happy to accept service recommendation despite the fact that it appears out of step with the industry, provided that a technical argument exists.

 

[Robg71]

I guess my Fords are similar, with the low c/r ???
There was a very noticeable change of exhaust note on mine after injectors done..
Nothing in the book either...

 

[vas]

Called Volvo and have the answer at last.

Older VP marine engines with PLI injection systems employed a low compression combustion strategy. A side effect of VP combustion strategy is that injector nozzles run very cold causing internal carbon build up, which in term causes disrupted spray pattern and bore washing, leading to bore glazing at relatively low hours.

OP's concern was a valid one and 1,000 hour advice from VP dealer was sound.

Always happy to accept service recommendation despite the fact that it appears out of step with the industry, provided that a technical argument exists.

Paul,

before getting overwhelmed with posts of everyone asking if their own diesel engines feature a low compression combustion strategy, care to tell us if you know of any other such motor???

{or to start the ball rolling, are my IVECOs SRM in this league? Although I doubt it, I'm planning to remove and get the injectors tested for flow and pattern anyway next month...)

cheers

V.