n/a or turbo engine

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rowland18
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Location: dorset

n/a or turbo engine

Post by rowland18 » Sat Dec 06, 2014 5:52 pm

Hi I have a David brown 4 pot engine that I have rebiult as it was all in pease when I got it but when it is running and hot it has reames of white smoke from the exhast I cant find eny numbers on the engine and was wondering if there is a way to tell if it is ment to be turbo

I had to buy a new piston for it and it was the same as a 1694 if this helps

Eny help much appreciated

Guest

RE: n/a or turbo engine

Post by Guest » Sat Dec 06, 2014 6:24 pm

The turbo pistons have an extra steel ring manufactured into it but don't tear the engine apart to see if they have or no as it won't make any difference to the smoke. White smoke usually means un-burnt fuel and this will be due to either the injector pump delivering too much to the injectors, the pump calibrated for a bigger model, 1490 and not a 990 for instance, or one or more injector nozzles not spraying properly. If you posted up some pictures of the engine we might well be able to identify it.

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rowland18
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RE: n/a or turbo engine

Post by rowland18 » Sat Dec 06, 2014 7:08 pm

Having some problems resizing the photos
Don't no if it help but the guy I got it off thought it was a 1390 but when I order the big end berrings for a 1390 they did not fit correctly as when done up the engine would not turn over
So I used the ones that were with it as in good condition
Thanks joe

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rowland18
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Post by rowland18 » Sun Dec 07, 2014 2:59 pm

Engine
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rowland18
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Post by rowland18 » Sun Dec 07, 2014 3:13 pm

Dint think they are the correct manifolds as where not bolted on just chucked in with the engine
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rowland18
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Post by rowland18 » Sun Dec 07, 2014 3:20 pm

Hope these help
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Dieter
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Post by Dieter » Sun Dec 07, 2014 4:39 pm

The block itself is no turbo block, as there is no oil return connection for the turbo.
Having said that, it does not tell if turbo pistons have been fitted.

As stated before, grey/ white smoke indicates unburned fuel / low engine temp.
- Have you checked fuel pump timing?
- Injectors have been tested?
- Does it smoke white on all 4 cylinders? When you remove the exhaust manifold, you can see each exhaust port of each cylinder individually..

Rare exhaust manifold btw, for an underrun exhaust, never seen it in real
Last edited by Dieter on Sun Dec 07, 2014 5:18 pm, edited 1 time in total.

Guest

Post by Guest » Sun Dec 07, 2014 5:12 pm

If you look on the back of the injector pump between the fuel pipes the plate should be stamped with the model it was intended for, ie 990, 995 etc which may give you a clue as to what tractor it came from. The exhaust manifold is for, as we call it, an 'under swept' system.

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rowland18
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Post by rowland18 » Sun Dec 07, 2014 5:28 pm

it is the same on all 4 pistons
All timed up correctly
Would the injectors give eny others symtems like bad starting
As it starts straingt away and runs smooth jus lot and lots of white smoke

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case-ih1594
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Post by case-ih1594 » Sun Dec 07, 2014 5:30 pm

Hi, looks like a 1390 (block) to me (spin on oil filter). The under / downswept exhaust is probably a rarity item itself and could do with swapping possibly.

It has an unusual 'extended' engine oil filler, and is that a Diesel heater that you can see in the bottom left hand side on picture 2 ?

All the pistons should be the same style and weight (i.e. matching).

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rowland18
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Post by rowland18 » Sun Dec 07, 2014 5:47 pm

Could it be that the cold start on the file pump was left on the on postion could it be stuck as it turn and nothink happens
Thanks joe

Guest

Post by Guest » Sun Dec 07, 2014 9:32 pm

If the cold start 'tap' was stuck in the 'on' position the engine would pop and miss-fire. The 'extended' engine oil filler tube together with the down swept exhaust manifold would suggest to me that the engine was a 'marinised' engine, fitted in a boat and the lack of an engine number convinces me of this further. If the engine has not been run much or worked since it's rebuild then I would expect it to smoke white, if you can run the engine under load for a day do so and then see if the smoke improves. Enlarging the picture it looks like it's an engine that would have been for a 990, 995 or 996 or possibly even a 1290 or at the outside possibly a 1390.

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case-ih1594
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Post by case-ih1594 » Mon Dec 08, 2014 9:59 am

Hi, regarding the possibility that it is / was a 'marine' engine, there is a good chance that these had lager 'turbo' grade crankshafts, con rods and pistons, although naturally aspirated.

Guest

Post by Guest » Mon Dec 08, 2014 12:11 pm

The marinised engines were nothing particularly special, the only differences were in the fittings such as fluid fillers, tubes and drains positioned or extended for better access as the engine would be mounted in a 'pit' below the deck. As for higher or heavier grade components these also would not be of any advantage, there is very little resistance in driving a shaft with a screw propeller in the water, a lot were directly driven with just a simple in and out of gear lever and another with a reverse gear, some were fitted with a 2 or 3 forward speed gearbox. There were many large fishing boats and medium trawlers on the coasts down here that were fitted with D.B engines back in the day, our local dealer serviced and maintained most of these engines on the Beer, Brixham, Torquay, Dartmouth and a lot of the other fishing places. These engines very often came without a cooling fan, there was no need for a fan or a radiator as the cooling was done by the pump sucking through sea water, you often see fishing boats with a stream of water coming out the side or back of them, that's the water going through the engine constantly being pumped through it.

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ollek
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Post by ollek » Mon Dec 08, 2014 12:29 pm

" there is very little resistance in driving a shaft with a screw propeller in the water". Not true, the power needed to turn the propeller is based on the size, pitch and rews of the propeller and this is therefore relative to the power needed to turn the propeller shaft and get the boat moving in the speed wanted. Bigger boats need therefore more power and bigger engines.

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