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Old 29-08-16, 08:53 PM   #1
listert
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Default Valve timing Lister L

hello guys,

my lister L stopped with a big bang during neunen
couldn,t get it going again.
started a thread and came to the conclusion it had to be the magneto.

but i have had the magneto rebuild and still only fireworks.
so now i,m suspecting the valve timing.
i read on several threads that the valves should be rocking on TDC
but that is not the case.
my exhaust valve is 3/4 open at TDC!

should they be and is it possible the timing suddenly changed?

thanks in advance, Brian
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Old 30-08-16, 08:15 AM   #2
martinpaff
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Hi Brian

I would certainly say that the valves should rock at TDC - this is fairly normal for Lister. If you would like to be sure I can check mine this evening.

If the timing has jumped then I can only think of two things:

Firstly perhaps you have lost a tooth from one of the gears! This doesn't seem likely because I am sure you would hear it, and the timing may continue to slip.

Secondly; I think Lister hold the gears in place with taper pins (not certain though; I've never had this area of mine in pieces - perhaps somebody can confirm?) If a taper pin has sheared then the gear could slip, and then maybe seize in place somewhere else. Again the likelyhood is low, but who knows?

Once you are certain that the valve timing is wrong you are going to need to take it apart - looking forward to seeing the answer!

MP
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Old 30-08-16, 08:30 AM   #3
listerdiesel
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All the L's and CS diesels had separate cams with taper pins.

That goes back to the early engines.

Peter
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Old 30-08-16, 11:29 AM   #4
listert
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good afternoon,

i checked the teeth they are all there.
the camshaft has taper pins indeed.

so setting the valve rocking at tdc is the best thing to do?
and by the looks of it i will have to take a flywheel of?

could you please check Martin because then i know it,s right
that LMH runs like a dream haha

regards Brian
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Old 30-08-16, 07:00 PM   #5
martinpaff
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Okay - I've checked...

The valve timing on my LMH rocks dead-central about TDC. The overlap is about 5 maybe 10 degrees.

MP
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Old 30-08-16, 07:51 PM   #6
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Two layouts for early engines.

Peter
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Old 30-08-16, 10:07 PM   #7
ransommecrawler
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I had this trouble with a F type an found the drive gear was only a press fit on camshaft after second time I drilled and pinned it never missed a beat again
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Old 30-08-16, 11:31 PM   #8
listert
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thanks guys

i will set the valves so they rock at TDC.
this means i have to get a key puller.
will take a few weeks to get here

i will keep you informed

thanks,
Brian
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Old 13-09-16, 10:12 PM   #9
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good evening,

started work on the lister this evening.
gib key came out in one piece

fortunely the flywheel can stay on the crankshaft.
the camshaft came out quite easy.
but i don,t think the taper pins slipped.
they all line up.

i guess the previous owner just set the timing wrong.
and compensated with the mag timing.
hope to get it back together this week.












regards Brian
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Old 28-09-16, 06:33 PM   #10
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got her back together again.
runs good now

only have to fit a new headgasket and it,s ready for next season.

regards Brian
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