Hi Mark,
I forgot about the cause. Indeed there was a broken chain tensioner. These
tensioners are so flimsy, I wonder if they do much of a job.
If the chain is running quiet, the surface of the tensioner remains smooth. A
broken tensioner, but also deep ridges, sometimes in a short time, are proof
that the chain was slapping on it. This happens when the sprockets are not
perfectly in line as is often the case when a billet steel crankshaft is
fitted. A wobbling chain means also that the ignition advance is not stable
with some loss of power. It shows with a stroboscope light. But this is
starting to look like a lesson, sorry!
Marcel
----- Oorspronkelijk bericht -----
Van: "fot" <fot@autox.team.net>
Aan: "fot" <fot@autox.team.net>
Verzonden: Vrijdag 25 december 2020 18:50:59
Onderwerp: Re: [Fot] [TR] Timing cover crank seal oil leak
On 12/25/20 7:37 AM, van.mulders.marcel--- via Fot wrote:
> On 2 occasions I had a leaking timing because of a small hole in the
> cover itself : once the hole had the shape of a thin line and was
> located near the rivets or spotwelds of the chain tensioner.
If the timing chain tensioner breaks so that you have a rough edge
riding against the cover, rather than a smooth curve, it will eventually
machine a slot into the cover. I've had it happen on some Spitfire engines.
mjb.
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