OM314 dynamic timing
 

Hello,
Working on a new engine in a '72 truck. This seems to need different timing at different revs. Does anyone know what the settings should be please?.
The manual only has static timing of 15 degrees BTDC.

Should this be in the vintage forum?. Thanks for any help.
Ralph.

I can't answer your question specifically, but if it's a mechanical injection pump the timing is usually a static setting for installation on the engine. Timing adjustments for RPM are typically done by a centrifugal weight mechanism on the drive gear or by a centrifugal advance mechanism internal to the injection pump.

The manual timing of 15˚BTDC is likely the static timing for installation on the engine and is likely all you should really be worrying about.

Thanks for reply.
 

That's useful stuff to check. Main symptom is smoking exhaust.
The new 314 engine is slightly different to the old one which didn't have the different timing settings so there is nothing in the manual. This is why I am asking the question.
It is in an LP 808 truck
Ralph.

The same still applies if it's a mechanical injection pump. There's a correct timing mark to align both the pump and the engine to when installing the IP. That is your base timing. Any sort of RPM dependent timing isn't something you can adjust yourself.

Recheck your base timing. Make sure you're actually on the timing marks you think you are and that the IP was timed prior to insertion in the engine.

The smoke color and smell also tell you a lot.

White smoke that stings your eyes is late injection timing and tends to have a very sharp/acrid smell to it
Grey smoke can be late injection timing or poor compression
Blue smoke is usually oil and tends to have a sort of "burnt plastic" or "burning crayon" smell to it
Black smoke is overfuelling or a restricted intake

Hello,

Can you clarify "White smoke that stings your eyes is late injection timing .. Grey smoke can be late injection timing" please?. Are both colours for late or is there a typo?.

What colour is early timing exhaust if not a typo?.
Thanks again,
Ralph.

I can't find my OM314 manual but this link shows how to do the drip test for an OM617

http://www.startekinfo.com/StarTek/outside/12265/disc_2/program/Engine/617/07_1-110.pdf

It is quite likely to be pretty close

(Best ignore this information there are subtle differences although it is useful to read as a familiarisation of the most common method)

Found the book.


What's your engine number? There are two static timing settings depending on how powerful the engine is.

The engine number is above 283204 - it has the 4 bolt hole compressor .
Hope this helps, could you just give the two settings if not?.

Oh dear - the motor number doesn't help.

My copy of the manual is in Dutch (which isn't a problem for me) but it might have a few translation issues.

The specifications are
engines up to 051028 (59kW) => 21 degrees before TDC
engines after 651953 (63kW) => 15 degrees before TDC

There's a big hole between those numbers where your engine number sits!

#####

There's a pointer on the front of the engine and one on the flywheel through the inspection cover (much like old Land Rover engines as it happens)

Still hoping you could say if Black - overfuelling would include early timing or not please. Otherwise what would it be?.
Ralph.

It is a 63kW engine so this should apply. Thanks for the help.
Ralph.