J3 full pump screws?

[NorthwichTrader]

On the front of the fuel pump are three slot-head screws, which have a small spot of yellow paint on the edge, which was presumably placed there by the engineers who overhauled it?

Problem is, all three leak diesel, can they be tightened, are they part of the settings?

Many thanks!

[dave moore]

Hi Stuart

 

There are bleed screws on the injector pump, but I think the ones you are referring to, each underneath the injector element, should not be disturbed. Can you put up a picture? I'm nowhere near the boat at the moment.

 

Dave

[NorthwichTrader]

Hi Stuart

 

There are bleed screws on the injector pump, but I think the ones you are referring to, each underneath the injector element, should not be disturbed. Can you put up a picture? I'm nowhere near the boat at the moment.

 

Dave

Thanks, Dave, will post up a picture tomorrow when I go back down!

RWD are hopefully handing the boat over to us next week! I've got all my church wood fitted up front, and we'll be liveaboards with a fortnight!

Hope you're keeping well!

[Timleech]

It sounds as though they are the screws which locate the elements. If so, yes they can be tightened within reason but that might invalidate any warranty on the pump overhaul. If that's a concern, take the pump back to where it was overhauled.

There may, depending on precise model of pump, be a little hole next to them with a piece of lead in it which 'engages' with a knurl on the screw head, that may be what the paint is on.

 

Tim

[Ben2542]

Stuart,

 

Here's a view of the injector pump on my J3, and the slotted screws you refer to (and the little hole next to them which Tim refers to). Mine have the slightest hint of a fuel weep now and again, if that helps.

 

 

Ben

[NorthwichTrader]

Stuart,

 

Here's a view of the injector pump on my J3, and the slotted screws you refer to (and the little hole next to them which Tim refers to). Mine have the slightest hint of a fuel weep now and again, if that helps.

 

 

Ben

Thanks for that, Ben, that's the screws I mean! Your pump looks a lot nicer than mine at the minute!

Incidentally, I wonder if they could be sealed up with a smear of some kind of silicon?

[BEngo]

Thanks for that, Ben, that's the screws I mean! Your pump looks a lot nicer than mine at the minute!

Incidentally, I wonder if they could be sealed up with a smear of some kind of silicon?

No!

 

If the element locating screws are leaking take the pump back where it was last serviced.

N.

N

[NorthwichTrader]

Thanks, N,

It was overhauled around 7-8 years ago by the previous owner (roger squires), but has only run around 6 or so hours in that time, and four of those not on diesel! It's my understanding that Roger never got to run it on diesel, only petrol!

A bit late for a warranty phone call unfortunately!

What did you think of a silicon seal?

Thanks, again, Stuart

[andywatson]

Stuart, have you got a build blog?

It would be nice to see some photos of your fit out.

[The Bagdad Boatman (waits)]

If RWD is Davis's at Saul ask them they are engine experts.

[BEngo]

Thanks, N,

It was overhauled around 7-8 years ago by the previous owner (roger squires), but has only run around 6 or so hours in that time, and four of those not on diesel! It's my understanding that Roger never got to run it on diesel, only petrol!

A bit late for a warranty phone call unfortunately!

What did you think of a silicon seal?

Thanks, again, Stuart

Silicone will not seal it for any length of time. Possibly a few days at most.

 

IIRC the screws are sealed with a tiny copper washer. You can try tightening the screws without affecting the insides, but the washers may be damaged, or simply need annealing.

 

Removing the screws to get at the washers may allow the pump elements to move, and because the position of the elements is critical, if you can't live with the leaks this is a job for a diesel injection specialist.

 

N

[NorthwichTrader]

Thanks all, can I just ask, whilst we are on the subject, why TWO hex nuts at the top of the pump?

 

And, no, Andy, no blog, but I'll post up what I've managed to achieve with our reclaimed fit-out this last 6 months...we're moving in the end of this week!

[Timleech]

Thanks all, can I just ask, whilst we are on the subject, why TWO hex nuts at the top of the pump?

 

Bleed screws.

For letting out air.

 

Tim

[dave moore]

Told you that yesterday! Your motor sounds fine, not quite the measured triplet of ours, but I wouldn't worry. Stash some money away for Brasso - ours costs a fortune!!

 

Good luck

 

Dave

[NorthwichTrader]

Thanks Tim and Dave, but why two? Looking at a dismantled pump in the shed, it's looks as if the enter the same internal void!

 

And Dave, when you say 'measured triplet,' what is there I can do to achieve that? Is it just one of those things with engines that have been rebuilt out of a number of different engine parts do you think?

[Timleech]

Thanks Tim and Dave, but why two? Looking at a dismantled pump in the shed, it's looks as if the enter the same internal void!

 

 

It can sometimes be useful to have two, to get rid of every last bit of troublesome air.

main reason is that the fuel can be supplied to either end of the pump, and you need to be able to bleed from the end opposite to the input.

 

Tim

[NorthwichTrader]

 

It can sometimes be useful to have two, to get rid of every last bit of troublesome air.

main reason is that the fuel can be supplied to either end of the pump, and you need to be able to bleed from the end opposite to the input.

 

Tim

Ahh, OK, thanks, Tim, that makes sense.

Much appreciated.