Timing a Volvo diesel engine-driven mad by waiting to have work done!!

SoulFireMage

SoulFireMage

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Joined
14 May 2006
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Portishead, Bristol, UK
richardgriffiths.azurewebsites.net
Hi folks

I'm slowly going bloody mad waiting to have the timing done on one of my Volvo engines. The guy has nearly timed it up however, there's apparently a mark missing further down on the engine and also there is an incorrect bolt and split washer (this caused the slipping of the timing) on the bit where the shims are. Sorry for the untechnical description, I'm not a mechanic at this time LOL.

The engine is a Volvo TAMD70C 300hp turbodiesel (F6 truck engine apparently).

Basically he's told me I can't put the bolt in myself as the timing is likely to slip. Can anyone point me to a resource that shows me the basics of how to set the timing myself so that I can clear up this mysterious art of timing. There is a diesel timing strobe left onboard, and he has shown me where the first marks are. They are nearly a centimetre apart at the moment LOL.

Thanks for any advice, links etc :-).
 
Question 1 Why are we "Timing" the motor?
2 are we timing the motor or the fuel pump?
3 What's gone on ?
4 Shims? valve shims?
Gis a bit more info and Someone will put you right!
 
LOL now I'm stuffed because I don't know how I'd know the difference. I do know that wherethe bolt has been incorrectly replaced there are two sets of shims (3 each) with a connecting rod in between. I also know that 2 marks at that end of the engine (by the alternator end) are a centimetre out. Apparently the mark at the other end is missing. She was hard starting and produced masses of smoke. Now she's timed up more or less, starts easily and half the smoke. Still needs that bolt, and retiming.
 
I'm not a deisel mechanic & I may have lost the plot but I didn't think that deisel engines had any timing ? Petrol yes, deisel no.

A deisel doesn't have any spark plugs does it ?
So what is there to time ?
 
Actually diesels do need to be timed.
A diesel injection pump has to deliver its charge to each cylinder at a certain point in the cycle .. normally x degrees (varies with each engine) before top dead centre (BTDC) of each piston .. there are fine adjustments to achieve this .. and this is 'timing'

the difference with petrol engines is that the spark plug fires at x degrees whereas in the diesel the fuel is fired under high pressure into the cylinder to cause combustion.
 
Do you know I never thought of that. /forums/images/graemlins/blush.gif
Makes perfect sense though. I stand corrected.

I told you I wasn't a deisel mechanic. I've learned something though so that's good.

Note to self. Think more, type less.
 
Re: Timing a Volvo diesel engine-driven mad by waiting to have work do

I put the links to the pdf diagrams of the engine timing case and flywheel housing so that you could explain which bits you are having a problem with. The links work ok when I try them.

I haven't worked on the engine but apparently there is a '0' mark on the flywheel, which presumably gives the crankshaft position but you haven't succeeded in finding as yet.

You have mentioned marks on the gears which apparently are not lined up correctly.

There is a carrier arrangement involving 'shims' for an intermediate gear which is perhaps what has come loose and caused the initial problem?

You will possibly be able to further describe the detail of the problem by refering to the diagrams which number each of the parts involved. The diagrams are from a site which sells parts for the engine so you should be able to obtain parts from them if some are missing and you cannot make them up.
 
Re: Timing a Volvo diesel engine-driven mad by waiting to have work do

Quite drunk here. Is it?
Be carefull it's all about timing!
Time to go to the Bar.
Time to get another one.
Time to go Home!
Time to look into the Forum, if You have Time to see if Your Timing prob is sorted.
Haven't got Time at the Moment.
Time to have a Drink right now.
Back in a bit when I have Time to think about Timing.
God look at the Time must go!
 
Richard
Sorry to tell you but you've entered a mine field - especially if you have no mechanical/engine experience.

To try and instruct someone in the "art" of "timing" a diesel engine can't be covered by just writing it down here, it takes years of experience and basic "lets try this and see what happens" stuff /forums/images/graemlins/tongue.gif

It depends on so many things like - Valve timing, injector pump timing, what type of injector pump (distribution pump) is fitted!

Some of the problems are.

You have a 4 stroke diesel engine - so the TDC (Top Dead Centre) mark on the flywheel will have 2 meanings - number 1 piston is firing or number 1 piston is exhausting - the only way to know which is which is to look at the valves, i.e. when number 1 is at TDC and both valves for that bore are closed (or on the rock) then it's "firing".

Now you have to work backwards - if number 1 is firing then the injector pump needs to be "timed" to deliver fuel at x degrees before TDC - check the workshop manual.

It's possible to get the timing 180degs out but you have said that the engine runs but still blows smoke and cr*p - this to me says that the injector pump needs to be "turned" slightly to adjust the final timing but how that is done is down to the engine/injector pump layout for your engine.

I know this info won't help you to much but!!!!

Peter.
 
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