Which copper washers for Bukh filter?

[Seal_surfer]

Maybe someone has this info?

Although she starts OK from cold, my Bukh 10 needs a while before settling into proper idle or reponding to acceleration. I am convinced this is due to air getting in at banjo unions on top of engine mounted secondary filter. This area has 2 unions sandwiched - one large, one small - and about 3 copper seal washers. I have wiped dry and this area seems to moisten when running, so may also be letting air in some times. I've tried re-sealing after annealing washers - no good.

So, question is: What size replacement washers are needed?

I could then have some ready for next visit to boat (yes, still sailing most weekends - Brrr!). I guess I should easily be able to get some from my favourite diesel specialist - Diesco in Ipswich.

Grateful for any info.

 

[Poignard]

The filter element and bowl are made by Bosch so they are probably available from a Bosch agent. I usually get them from BUKH [UK] Ltd. when I'm ordering other spares. I'm sure they are overpriced but I can't find anywhere locally to buy them and taking an hour off work to go and get them would cost me more in lost earnings. Firms like Screwfix offer joint washer kits but, like most such kits, you would quickly get through the useful sizes and end up with loads that don't fit anything!

My secondary filter is always moist and it is difficult to find out where it leaks because it is in a dark inaccessible place. Also any leakage drops onto one of the flexible mounts and causes the rubber to go soggy.
I would like to replace the whole assembly with a screw-on cardridge type like the lub oil filter but BUKH say it's not available

[Just noticed you are in Suffolk. ASAP Supplies Ltd of Beccles sell them]

 

[SimonJ]

You can probably just anneal your existing washers. Remove, heat to cherry red over your wife's gas ring in the kitchen (holding in a pair of pincers,say) then drop into cold water. After that the copper will be soft and ready to seal again when you replace & tighten. Otherwise Al at BUKH UK will sell you a set of washers so you have some sized for each joint

 

[morgandlm]

I experience exactly the same symptoms as you describe with my Bukh DV10. I was told by the Bukh guys that this is normal and is the consequence of the indirect injection and the absence of pre-heating. It is certainly true that the symptoms are more noticeable when really cold. Perhaps we must just put up with it. The engine certainly operates OK once warm.

Morgan

 

[jerryat]

It certainly isn't normal!! I had a B10 for 6 years and never had the slightest leak anywhere. I suspect there is a distortion in the banjo itself.

To check, place some 1000 wet and dry face up on a piece of flat glass. Wet it and, pressing the face of the banjo against it, rub it gently back and forth about 6 times. Wipe off the residue and check the surface.

It is quite likely that an area (or two) on the rim will be untouched. Continue the 'sanding' until the entire surface is flat. Turn over and repeat on the other side. The whole process takes no more than 3-4 minutes.

Now anneal the copper washers as mentioned earlier and re-assemble. Job done - no leaks!!

Out of interest, I had a slight leak on the excess fuel connection to one of the injectors I had serviced recently on my current B20. Checking as above showed that the 'diesel engineers' had distorted the banjo. I rectified the problem as above.

 

[Seal_surfer]

Thanks for the good advice - as always.

I do have the manifold electric heater coil for v cold days, but the "problem" is generally worse the longer left (like weeks), regardless of air temperature. In fact, she initially runs OK for a few secs, then slows to v slow idle (air drawn in to inj pump?), before clearing and picking up. I must admit that this engine is not known for quickly picking up revs - but there are limits!! ;-)

I hadn't considered the possibility that the banjo union surfaces could be untrue - Will check and dress flat. Certainly worth investigating.

This will probably be best done at home, so will take washers down to Diesco who should be able to match up & sort me out.

Thanks again.