Engine clank

[Ray T]

No help, but if you called your engine Thomas, would it be "Thomas the clank engine?" 😁

 

On my way to the door. 

[Tracy D'arth]

42 minutes ago, GBW said:

Thanks.

I only asked about removing the top hat to check if there was an atomiser washer present.

It seems that whoever rebuilt the engine, omitted the atomiser washers.   I do not understand their function unless it is only to stop blow back.

I'm not quite old enough to be responsible for the design but I would think that they seal the injector to the combustion insert top had to prevent fuel getting between the two and causing carbon build up. The injector will not seal onto the steel top hat alone when hot, hence the crinkled washer. 

Any space there would also lower the compression ratio.

 

You mentioned that the replacement injector sits higher or is longer than the original ---  are you certain it is a BMC injector and not a Perkins one which looks similar but  is longer and can lead to top hat fracture?

[GBW]

I only changed the nozzle.   

I can't find a figure for the torque setting for the injector hold down nuts.  Presumably the atomiser washer does not end up completely flat.  Is there some resilience remaining when the injector is correctly torqued down?

[Tony Brooks]

Just now, GBW said:

I only changed the nozzle.   

I can't find a figure for the torque setting for the injector hold down nuts.  Presumably the atomiser washer does not end up completely flat.  Is there some resilience remaining when the injector is correctly torqued down?

Probably, but they always come out a bit flatter than when they went in.

[Tony Brooks]

Been looking online. For the Perkins 4-10X which is very similar 12 ft lbs or 16Nm

 

This suggests the same http://www.sckruger.dk/Operator's handbook BMC 1.5-Litre Diesel Engine.pdf

[magnetman]

One of my Austin J4 manuals says 12 ft lb for the injector securing nuts.

 

I have two manuals due to the fact the boat has two BMC 1.5D engines ex Austin J4. I imagine the other manual will have the same figures in it.

 

Edited January 24 by magnetman

[GBW]

28 minutes ago, Tony Brooks said:

Probably, but they always come out a bit flatter than when they went in.

The two references I have (one courtesy of Tony) show the atomiser washers either point up or point down.  It would seem not to matter.

Much more importantly, they both show the presence of a washer (copper?) on the end of the injector.  I expected to find one such but did not.  That would limit the insertion depth and also determine the loading on the atomiser washer.

Curiouser and curiouser.

[Tony Brooks]

8 minutes ago, GBW said:

The two references I have (one courtesy of Tony) show the atomiser washers either point up or point down.  It would seem not to matter.

Much more importantly, they both show the presence of a washer (copper?) on the end of the injector.  I expected to find one such but did not.  That would limit the insertion depth and also determine the loading on the atomiser washer.

Curiouser and curiouser.

 

I always fitted the atomization washer flat side down, so was surprised to see the illustration in the link.

 

There should be a copper washer around the nozzle that seats on to the top hat and the nozzle holder "nut". If you had had the injectors overhauled by a specialist they normally supply new washers on the injector for that particular duty, but not the thin ones under the top hat.

 

 

[Tony Brooks]

No copper sealing washer and no atomisation washer! I think that your clank may well have been gas leaking past the injector, let alone a poor spray pattern causing more diesel knock on one cylinder.

[GBW]

Don't ask me who supplied the engine!

[magnetman]

+ ?

[MtB]

1 hour ago, GBW said:

Don't ask me who supplied the engine!

 

How about a list of all who didn't supply it?!

 

 

[Tony Brooks]

Would @Tracy D'arth's warnings be relevant here. I can't see the boss of Calcutt that I knew accepting that level of skill.

[bizzard]

The chap on the boat behind me ordered an alternator from Calcutt, it was the wrong hand for a BMC 1'5 diesel, Ridiculous, All the BMC B and A seres petrol and diesel engines have the same hand and similar fittings on the same side. He didn't send it back but kept it. I got him one from my suppliar and fitted it. 

[Goliath]

18 minutes ago, bizzard said:

The chap on the boat behind me ordered an alternator from Calcutt, it was the wrong hand for a BMC 1'5 diesel, Ridiculous, All the BMC B and A seres petrol and diesel engines have the same hand and similar fittings on the same side. He didn't send it back but kept it. I got him one from my suppliar and fitted it. 

can’t you just turn the top around?

undo the 3 nuts and turn the two halves to become the opposite ?

[magnetman]

I think the fan is the problem. 

[Tony Brooks]

Just now, Goliath said:

can’t you just turn the top around?

undo the 3 nuts and turn the two halves to become the opposite ?

 

May have to drill a thread out ans supply a nut, but, yes, in most cases you can.

Just now, magnetman said:

I think the fan is the problem. 

 

You may be correct but many come with non-directional fans and that would normally be referred to a "the wrong rotation".

[bizzard]

7 minutes ago, Goliath said:

can’t you just turn the top around?

undo the 3 nuts and turn the two halves to become the opposite ?

A127. I offered to do that but he said no, if it's fiddled with Calcutt might not exchange it or return his money. He still has it though.

[Goliath]

I say because I’ve just bought one, changing from a 55A to a 70A A127

Its arrived right handed which is what I wanted but the mounting brackets were at bottom and adjuster at top,

I want adjuster at bottom, so I’ve turned the top around, the fan will still spin in the same direction.

If that makes sense.

And yes I’ll have to drill out the threaded hole 

 

 I’ve realised I will have to upgrade the relay split charger too from a 60A to 🤷‍♀️ 100A and maybe some bigger/fatter wiring too

So I’ve put it on hold while I fathom it out.

 

 

Edited January 24 by Goliath

[GBW]

No, it wasn't Calcutt!