[TR] What is the knock?

[Peter Ryner]

Before tearing into the engine too much check your fan belt.  I had a similar noise, thought it was in the engine.  Took out the pushrods and tappets and found nothing.  Put it all back together and noise still there.  I was under the car trying to listen for the noise and had someone accelerate the motor.  Heard the noise right above my head.  The belt had broken some of the metal fibers inside and under acceleration they were swinging out and hitting the cross bar in front of the engine.  Never hurts to look around.
Pete

-----Original Message-----
From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of TeriAnn J. Wakeman
Sent: Sunday, June 23, 2019 10:26 AM
To: triumphs at autox.team.net
Subject: Re: [TR] What is the knock?

On 6/23/19 7:12 AM, Randall wrote:
> With respect to TeriAnn, I don't see how a valve train problem can get 
> louder under load, since the load on the valve train does not depend 
> on the load on the engine.  A rod knock, OTOH, gets a LOT louder at 
> low rpm and heavy load.
Next time you are adjusting valves, loosen one to about 1/4" gap, put the valve cover back on and start the engine. Then take it around the block. Not trusting my own diagnosis at the time I took the car to a couple shops and they all said top end rod bearing.
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