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 Post subject: Is L24 an Interference Engine?
PostPosted: Thu Jul 22, 2010 1:48 am 

Joined: Tue Jun 22, 2010 12:05 pm
Posts: 8
Location: Germany
Since I have it, some serious clicking is audible from my Laurels L24S. I adjusted the valves but noticed a fairly loose timing chain. Since I would have to remove auxiliaries and pulleys to rectify this, it might be a while till I have the time. Is it well to drive on with it, or is the L24 a interference engine and i would cock it up, if the chain gives in?


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 Post subject:
PostPosted: Sat Jul 31, 2010 7:07 pm 

Joined: Thu Jul 29, 2010 7:58 am
Posts: 13
Location: puget sound
I played with the l20s for a bit and was told they were an interference motor, but that wouldnt be a clicking. valve/piston interference is waay worse than a click.

And in case im wrong, lets call this a bump.


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 Post subject:
PostPosted: Sun Aug 01, 2010 9:12 am 

Joined: Mon Apr 12, 2010 9:49 pm
Posts: 505
Location: snohomish, washington
Depending on how loud the tick is. It could be valve tick which is mostly caused by lack of oil to the head. This is more of bottom end stuff but it also could be rod knock if its loud.

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 Post subject:
PostPosted: Wed Aug 04, 2010 11:00 am 
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Joined: Thu Nov 13, 2008 3:30 am
Posts: 28
Location: Romania, Europe
Can you hear that click all the time? or just when you rev the engine?

On my diesel Laurel (LD28) I had this kind of click and it turned out that the timing chain was a bit loose. But I've been able to adjust the tensioner with a screwdriver.

I've never seen an L24 with the rocker cover off but there should be a tensioner somewhere.

I hope this helps.

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 Post subject:
PostPosted: Thu Aug 05, 2010 7:09 pm 
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Joined: Fri Oct 12, 2007 8:57 pm
Posts: 8523
Location: Arlington, TX, USA
Florin wrote:
I've never seen an L24 with the rocker cover off but there should be a tensioner somewhere.


It's inside the timing cover, sort of behind the crank pulley. :wink:

The chain tensioner is usually not adjustable, it's spring loaded so it's always tight. Most likely the chain guides are wasted.

Whether or not the engine is an interference design is really not important. Never once seen or even heard of a chain failure in a (normally driven) L-series engine. That shouldn't be a major concern. :tu:


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 Post subject:
PostPosted: Thu Aug 19, 2010 9:23 pm 
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Joined: Mon Sep 01, 2008 1:48 pm
Posts: 25
Location: Bay Area
Yes, they are interference engines and here's the proof:

Image

All 6 exhaust valves tapped the top of the pistons at over 9500 rpm...

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