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Canadian Poncho Homepage -> Canadian Poncho -> 58-64 Full Size Power Train Tech Forum -> 1960 GM 261 cui 6 cylinder engine noise
Post Info TOPIC: 1960 GM 261 cui 6 cylinder engine noise
TDS


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1960 GM 261 cui 6 cylinder engine noise
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Hi

My engine has a low knocking sound and I cant locate it.

Its not continiusly.

It appears when the engine rises to normal working temperature.

 

The engine is running smoothly both at idle and at driving but it has a tendency to miss when it gets hot

Number 12346 sparkplugs are burnt brown.

Number 5 is more black/brown.

 

I guess the missing and the knocking is not connected.

 

Does anyone have an idea of what could cause the above ?

 

Thanks.

 

 



-- Edited by TDS on Sunday 4th of May 2014 02:21:08 AM

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73SC


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1960 GM 261 cui 6 cylinder engine issues
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A bad coil will fail when hot, resulting in misfiring and engine noises as engine falters under load. A coil for that engine has to be all of 12 bucks. Start slow and simple and don't expect the worse case. A full tune up with coil, dist. cap, points,  plugs and wires and timing set might do wonders. 



-- Edited by 73SC on Friday 2nd of May 2014 12:30:09 PM

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TDS


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Posts: 58
Date:
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Thanks for your reply

I replaced the sparkplugs, plug wires and upgraded to a pertronix ignitor last year.
Didnt replace the coil.
Have had some issues with reading the timing and rpm with my instrument - maybe the old coil doesnt provide enough voltage to the sparkplugs.

Have ordered a Flame Thrower coil.
Should I add a resistor when using that coil?


I will also take a look at the valve lifters - they are hydraulics.

I found this procedure:
"If these are hydraulic lifters, adjust them with the engine running and when its hot.
Back off the adjusting nut until you get play (noise) and then tighten until play goes away and tighten another 1/2 turn past that.
Then do the same with the rest of them"





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hawkeye5766


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RE: 1960 GM 261 cui 6 cylinder engine noise
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Disconect your vacume adv and see if it goes away. Had the same prob and found that it was my pertronics, don't know why but when the motor got hot and the plate in the distributor advanced, the ign would cut out.Might have nothing to do with it, but if new coil doesn't fix worth a try. Coil should say internal resister on it as far as I can remember or you can check output voltage to points, 9 volt I think?? Check and see what pertronics uses for voltoge, maybe it needs 12 volt?

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427carl


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TDS wrote:

Thanks for your reply

I replaced the sparkplugs, plug wires and upgraded to a pertronix ignitor last year.
Didnt replace the coil.
Have had some issues with reading the timing and rpm with my instrument - maybe the old coil doesnt provide enough voltage to the sparkplugs.

Have ordered a Flame Thrower coil.
Should I add a resistor when using that coil?


I will also take a look at the valve lifters - they are hydraulics.   Leave them for now    chase one item at a time




 



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