Diesel misfire

[chrishelen]

Hi,

I have a single cylinder Sabb 10hp diesel in my boat and i have noticed a slight intermittant misfire,i want to nip this in the bud so have tried changing the fuel filters but it is still there,

Also at mid revs under load i have noticed the tone of the engine change for a few seconds then back to normal,this doesnt seem to affect the boat speed.

Thanks in advance for any help forthcoming.

 

[sarabande]

is there any chance you have some petrol in the fuel ?

(I did this in the car, and the engine produced a misfire as you describe)

It's either that, or you have an air leak upstream of the injector pump.

 

[dingdongs]

try running a fresh fuel supply from an outboard tank or similar to make sure its not tank problem/diesel.

 

[rafiki_]

Sounds like an air leak to me.

 

[chrishelen]

Thanks for the replys,
Sarabande, I dont thinks its petrol in the diesel,i have a trusted supplier,
but i was thinking along the lines of air getting in the lines somewhere.The old CAV filter i took off had a lot of gunge along the top of the element.