Cleaning Injectors?

Talulah

Talulah

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How hard it is to remove the injectors and clean them on a Yanmar engine?
I'm getting lots of smoke so want to try cleaning the injectors before I resort to bigger bills. I have tried the fuel additives with some effect.
Is it something a resonably competent person can do or do you need specialist tools?
Many thanks in advance.
 
You don't normally need to clean them. The pressure in them is so high that any any bits and pieces are blown away. You can test an injector by pulling it out of the head and reconnecting onto the injector line in mid air. Turn the engine over and you'll have some idea of how good it is. You'll need new seals to properly refit the injector so buy them before you need to have your engine running again.

Important safety note.............Do not put ant part of your body near the injector orifice as diesel can blow through your skin.
 
To take them to bits you would need to relax the spring so would need a test pump to set them up again - in others words send them to diesel specialist!
 
Speak to Steve Jupp round at Royal Clarence - he'll point you in the right direction. PM me if you want his contact details.

rob
 
Watson Diesel in Wimbledon.
You may want to try a compression test while they are out.
Again dear piece of kit so get the engineer to do it.
 
At 500 hours I am surprised you think your injectors need servicing. I am still on the same untouched injectors at 2500 hours.

Does your smoke occur only at starting? If yes, you definitely need not touch the injectors. If it's very heavy and or continuous smoke, that's unburnt fuel - needs some checking out, but might still not be injectors.

PWG
 
Mine have done 5 times that without being touched!
Is the smoke only on start up? Mines a bit like that but when hot she`s fine ( bit like the wife!). Good luck
 
Re: Cleaning Injectors? - BE CAREFUL

I would be surprised if you needed injector overhaul at those hours unless your filters were perished and letting particles through.
As for DIY dismantling - don't unless you have training and the right test and set up tools. As for testing be VERY careful, it is easy to get blood poisoning through the diesel being injected into your bloodstream at 3/4,000psi.
Even on big slow speed marine eninges of 10,000hp we used factory refurbished matched nozzle/needle sets and did not attempt this aspect ourselves only reassembling with these tips and then setting the spring pressure and testing for fine atomisation.
As others have said its cheap enough to get this done by the professionals and should with todays fuel quality at marinas last you for couple of thousand hours.

Wipe some copperslip around the injector when refitting, if the seal between cylinder head and injector nozzle seat fails it prevents the resultant carbon build up sticking the injector in the cylinder head. Again at sea I have known cylinder heads having to be taken off due to the only way to get the injectors out when this happened being to drift them out by 4 lb club hammers from the piston side of the head.

Brian
 
Re: Cleaning Injectors? - BE CAREFUL

I think Brian might be referring to large (MN) engines where the injectors can be up to about 3 foot long and heavy. If they needed to be hammered out then the tip would be replaced.
 
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