Bukh DV10 1973 Oil Thingy

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weliwarmer

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Hi,

While replacing the oil pressure sensor on my 1973 Bukh DV10, I can see a pipe from the sensor mount, going up under the dynastart, wrapping around the top of the engine and ending up at another thing that looks like a broken sensor on the top, just behind the flywheel.

It's not on the diagrams in the owner's manual so I'm confused as what it's for. Anyone have any ideas?

20191121-191657-1.jpg


Thanks,
Tim
 
I've done something very similar on a car, although with a plastic high-pressure pipe, so that I can install a pressure gauge whilst retaining the standard oil pressure alarm/light sensor.

That might be an explanation.

Richard
 
That's true, thanks Richard.

It does not have a pressure switch inside the "sensor" but maybe that's disintegrated sometime over the last 46 years. It's now just acting as a cap on the end of the pipe.
 
This might perhaps be of help, or further confuse matters. As it happens, I stumbled only yesterday upon an old PM I'd sent someone who had been struggling to find the engine coolant drain plug.

'I've never been able to find the drain plug on the port hand side of the engine, shown in the manual and mentioned by others on that [earlier YBW] thread.

I have just been wrestling with the anode bolt on my Bukh DV10 and stumbled across [what I guess to be] a drain tube for the coolant on the starboard side of the engine. It's a brass tube, with brass hexagon head cap, exiting from under the starter, just adjacent to and above the oil pressure switch. I can't see quite where it comes out of the engine. This doesn't appear in the owners's manual, and my engine is non-standard, in that it's been converted to indirect (freshwater) cooling, but it presumably does mean there is a drain in the engine block somewhere behind the starter in the standard engine (with just a blanking plug as standard, I guess).

Probably not going to want to remove the starter as a matter of routine, but if you really need to completely drain the engine sometime it might be worth exploring. '

Whether my guesswork was correct I never found out, and can't remember any more about it.'
 
LittleSister said:
This might perhaps be of help, or further confuse matters. As it happens, I stumbled only yesterday upon an old PM I'd sent someone who had been struggling to find the engine coolant drain plug.

'I've never been able to find the drain plug on the port hand side of the engine, shown in the manual and mentioned by others on that [earlier YBW] thread.

I have just been wrestling with the anode bolt on my Bukh DV10 and stumbled across [what I guess to be] a drain tube for the coolant on the starboard side of the engine. It's a brass tube, with brass hexagon head cap, exiting from under the starter, just adjacent to and above the oil pressure switch. I can't see quite where it comes out of the engine. This doesn't appear in the owners's manual, and my engine is non-standard, in that it's been converted to indirect (freshwater) cooling, but it presumably does mean there is a drain in the engine block somewhere behind the starter in the standard engine (with just a blanking plug as standard, I guess).

Probably not going to want to remove the starter as a matter of routine, but if you really need to completely drain the engine sometime it might be worth exploring. '

Whether my guesswork was correct I never found out, and can't remember any more about it.'
Click to expand...

I assumed from your OP that the pipe was connected into the oil system. If it's connected into the coolant system, it's definitely not a remote oil pressure line. ;)

Richard
 
Maybe not relevant, but the DV20 has an external oil feed pipe to the rocker box. If you want an oil pressure gauge, Bukh fit the sensor on a banjo there, not on a tee piece with the standard oil pressure switch on the stbd side as you might expect. So perhaps your blanked off pipe is for an oil pressure gauge, not now fitted?
 
Having had a look at the DV10/20 Parts Manual I'm now inclined to think it may be part of the lubrication system - See drawings page 32 (DV10) and 33 (DV20) and corresponding parts list page 34 onwards.

Is it parts 43, 44, 47, 48, 49 & 50 on page 32 (DV10)? These are the oil pipe for the rockers, plus various bits, but seem to correspond with the similar assembly (#23) for the DV20 on page 33, which I don't think goes to the rockers, and is described as an 'overflow valve complete'.

Parts Manual can be downloaded here and various other places https://sw10696.smartweb-static.com...s list/Spare part list - BUKH DV 10-20 ME.pdf

p.s. I was interrupted for dinner while mid-way through writing the above. I think Neil S. may have it. There's an inset sub-drawing on page 33 which has a 'manometer' fitted in what seems likely to be that location. (But I can't any relate any of the drawings exactly to what the OP's post shows, and what I remember of the DV10.)
 
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I believe an Oil Pressure Gauge Transmitter part no: 552J0926 is screwed into it, and that has an electrical connection to a Pressure Gauge on the full instrument panel.

See BUKH Parts Manual section: E5, page 241 et seq.

The full instrument panel is an optional extra which my engine does not have. I have the basic panel and that does not include a temperature gauge, oil pressure gauge or tachometer.

The first I know of low oil pressure is a bleep and a blue lamp showing! :(
 
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Thanks for all the replies.

Richard, it's definitely an oil pipe. I agree with everyone that it's probably where the pressure sensor used to be. I'm searching for a sensor that will fit that mount and thread. Google can't see a supplier of 552J0926 so possibly a VDO sender, anyone know the best person to call about it?

BTW When I bought the boat as a doer-upper, most of the oil was in the bilge!
 
Update

Today I received a copy of the early variant DV10M/DV20M Operating Manual. There is a manometer shown on this model exactly where the oil thingy is. So LittleSister was rightest! I have a couple of diving air tank gauges that look like they are the same fitting so I'll try them and, it one fits, order a more rugged manometer to sit permanently on the top of the Bukh.

Thanks again for everyone's help.

On a side note, I discovered that one of my friends is the son of the main UK Bukh specialist who retired a few years ago. I have a Bukh expert currently in my kitchen!
 
weliwarmer said:
Update

Today I received a copy of the early variant DV10M/DV20M Operating Manual. There is a manometer shown on this model exactly where the oil thingy is. So LittleSister was rightest! I have a couple of diving air tank gauges that look like they are the same fitting so I'll try them and, it one fits, order a more rugged manometer to sit permanently on the top of the Bukh.

Thanks again for everyone's help.

On a side note, I discovered that one of my friends is the son of the main UK Bukh specialist who retired a few years ago. I have a Bukh expert currently in my kitchen!
Click to expand...

I'm totally confused. We've been assured several times that it's an oil line which is why I suggested that it was for a pressure gauge in post #2.

Are you now saying that it's a coolant line as suggested by Little Sister? :confused:

Richard
 
Hi Richard. Sorry for the confusion! It's definitely an oil line and the Owner's Manual shows an oil pressure gauge/manometer fitted to it. Looks like the manometer on my engine has been replaced by a cap.
 
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