KAMD300 can serviced injectors cue knocking?

[Sailing50]

Have recently bought an MF925 fitted with a KAMD300. The valve clearances have just been done but the engine is knocking on No1 cylinder.

When we turn off the injector off the knocking stops but when it’s back on it starts again.

Injectors haven’t been serviced for a long while if at all, so they’ve been sent off for servicing.

Am hoping this will cure the knock, anyone else had this problem? And did servicing the injectors solve the knock?

 

[Bandit]

Engine 20 years old ish, how many hours?

I would go fuel system and sample tank carefully.

Check around intercoolers very carefully for any leaks the intercoolers have a habit of corroding and rotting casing. Perhaps use an accredited VP engineer for this.

Worth considering service exchange VP injectors if fitted by a VP dealer 2 year warranty?

Be careful, tread carefully, be thorough a hosing injector or a corroded oil cooler can cost you an engine.

 

[petem]

Engine 20 years old ish, how many hours?

I would go fuel system and sample tank carefully.

Check around intercoolers very carefully for any leaks the intercoolers have a habit of corroding and rotting casing. Perhaps use an accredited VP engineer for this.

Worth considering service exchange VP injectors if fitted by a VP dealer 2 year warranty?

Be careful, tread carefully, be thorough a hosing injector or a corroded oil cooler can cost you an engine.

I'm not sure why you think that a VP dealer is essential for any of these tasks (which are all straightforward for a competent mechanic)?

 

[Bandit]

Each engine has it's own foibles and common problems to find.

Being very familiar with a brand and a model of engine allows you to find and identify a normal problem straight away.

You get a 2 year parts and labour warranty with a part fitted by a VP Dealer if it fails.

 

[petem]

Each engine has it's own foibles and common problems to find.

Being very familiar with a brand and a model of engine allows you to find and identify a normal problem straight away.

You get a 2 year parts and labour warranty with a part fitted by a VP Dealer if it fails.

I've seen some truly shocking work carried out by VP dealers and some excellent work done by independents (and vice versa). As for experience, there's no reason why a VP dealer mechanic will be any more experienced than an independent.

And it's not so long ago that one of the south coast VP dealers lost their franchise due to them wrecking some customer's engines.

Personally, I'd choose the best person for the work, irrespective of whether they are an official agent or not.

 

[jon and michie]

I've seen some truly shocking work carried out by VP dealers and some excellent work done by independents (and vice versa). As for experience, there's no reason why a VP dealer mechanic will be any more experienced than an independent.

And it's not so long ago that one of the south coast VP dealers lost their franchise due to them wrecking some customer's engines.

Personally, I'd choose the best person for the work, irrespective of whether they are an official agent or not.

Reputation goes a long way

 

[47GC]

I’d assume, the dealer engineers should be fully trained by VP. The actual servicing is not rocket science any competent engineer should do a good job. In my eyes, I’m paying more to make a trained & competent engineer work on my boat. If something goes wrong, I have the dealer & ultimately VP to goto. With an independent, they have limited resources to rectify & I would have less options.

 

[volvopaul]

I've seen some truly shocking work carried out by VP dealers and some excellent work done by independents (and vice versa). As for experience, there's no reason why a VP dealer mechanic will be any more experienced than an independent.

And it's not so long ago that one of the south coast VP dealers lost their franchise due to them wrecking some customer's engines.

Personally, I'd choose the best person for the work, irrespective of whether they are an official agent or not.

I wonder who that was .

 

[PCUK]

Swap two injectors between cylinders and see if the noise follows the injector. If not then it's probably mechanical.

 

[volvopaul]

Interest comments on dealer versus independent.

With issues on the older edc range ie 44/300/73/74/75 I am finding customers asking me why the dealers no longer have engineers that know the older engines , it’s a simple answer really that the training course was in the early 2000s , I was in my very early 40s then when I attended the course , the men that know these are now in there 60s , present company accepted .

There are engineers at dealers that have no idea about these engines , other than looking at a screen in an office , there are also ones that will have no idea how to remove an injection pump let along time it up , you can blame the advent of common rail for that .

 

[kashurst]

Swap two injectors between cylinders and see if the noise follows the injector. If not then it's probably mechanical.

Ordinarily I would agree. But the KAMD 300 engine has a sensor in injector number one, (the problem cylinder) that detects when the injector opens and sprays. That moment is used by the ECU to manage the engine and adjust the injection pump timing. The OP could swap injector one on the problem engine to injector one on the other engine (if it's twin engined).

As the engine is making a knock sound if injector one is enabled, I would be pulling the injector out and having it tested. If it is not spraying a mist and instead just firing droplets into the cylinder it may knacker the pistons. The droplets of diesel will burn too hot and explode rather than burn and likely in contact with the piston crown. Potentially easy to fix but disasterous if left and the engine run for any time or load.

 

[volvopaul]

Swap two injectors between cylinders and see if the noise follows the injector. If not then it's probably mechanical.

Not an easy job

 

[PCUK]

Very few things in life are Paul. Especially on boats.

 

[Mr Googler]

Very few things in life are Paul. Especially on boats.

I’ve just done valve clearances on a pair of 44’s for a mate. It is absolutely the world’s most frustrating job. Everytime you take a component off you ask yourself………why does it have to be this hard

We did however try an aftermarket gasket….it was awesome! That’s the worse bit….do all that and have a rocker cover leak

 

[Sailing50]

Ordinarily I would agree. But the KAMD 300 engine has a sensor in injector number one, (the problem cylinder) that detects when the injector opens and sprays. That moment is used by the ECU to manage the engine and adjust the injection pump timing. The OP could swap injector one on the problem engine to injector one on the other engine (if it's twin engined).

As the engine is making a knock sound if injector one is enabled, I would be pulling the injector out and having it tested. If it is not spraying a mist and instead just firing droplets into the cylinder it may knacker the pistons. The droplets of diesel will burn too hot and explode rather than burn and likely in contact with the piston crown. Potentially easy to fix but disasterous if left and the engine run for any time or

 

[Sailing50]

Update…injector 1 needs both servicing and the wire was faulty so not communicating with EDC this surely must have been the root cause of knocking. This is being replaced with new

Injectors 23456 all gummed up so they are being serviced.

Hopefully this will be the end of the knock

(As said before we did isolate the problem down to a knock on 1 that went away when the pressure on the injector 1 was released)