Following my request elsewhere on this site for a TC exhaust gasket, I actually managed to find one in an 'old' headset I had 'in stock' from a 125 engine. I was rather surprised that the standard exhaust gasket for a 1608cc unit is also specified for the 1438cc, and fits the 1995cc exactly. Perhaps I should have realised this after more than 20 years around Fiat twin cams?!?!
I was searching for an exhaust gasket as I believed that the one on my Racing's engine was blowing. After removing the exhaust manifold and carrying out all of the associated draining down of coolant, etc, I found that the gasket had indeed blown, so my time wasn't wasted, but after reassembly and running up the engine again I find that there is still a 'ticking' noise from the engine.
At first I thought it was still the gasket, but a thorough inspection has found that the exhaust system is air tight. I am now lead to believe that it might be a tappet. The noise is worse from the 'inlet' side of the engine, and seems to occur when one specific cylinder (although I don't know which one!) is firing, a sort of '1 in 4' noise.
My queries are
1) Is it likely to be a tappet?
2) Could it be an 'induction' noise? Could this sound the same as a tappet?
3) What else could it be? (suggestions)
I realise that this is a very open query, with many potential answers, but I'm concerned that there may be something obvious that I'm missing.
The car is due an MoT in a couple of weeks and will fail if the tester believes it's the exhaust.
Thanks
Simon
Fiat 131 Racing - gaskets and engine noises
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Fiat 131 Racing - gaskets and engine noises
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Fiat 131 Racing
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Well, Simon
the most obvious thing to do without delay is check the valve clearances, I set them at 16/18 thou" in/ex, +/- 2 thou.
Also check the condition of the cam lobes, they should have a nice smooth radius, but go 'pointy' and elliptical when worn. The cam/bucket rattles quite badly when the clearance is loose.
I have shim tools for sale if you need one and can supply shims on mail order readily enough.
GC
the most obvious thing to do without delay is check the valve clearances, I set them at 16/18 thou" in/ex, +/- 2 thou.
Also check the condition of the cam lobes, they should have a nice smooth radius, but go 'pointy' and elliptical when worn. The cam/bucket rattles quite badly when the clearance is loose.
I have shim tools for sale if you need one and can supply shims on mail order readily enough.
GC
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