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Very Noisy Tappets On My Spi


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#1 dmandan

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Posted 12 September 2019 - 03:58 PM

Hi, I recently had the head off did all the porting ect, have put it back together with 1.5 rockers set gaps to 15thou as advised but have one really noisy tappet. Oil is good, rockers are on properly so the oil channel is working.

 

Anyone got ideas what to check next?



#2 whistler

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Posted 12 September 2019 - 06:14 PM

If the 1.5 rockers were second hand then the rocker shaft could be worn.



#3 mina08

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Posted 13 September 2019 - 09:04 AM

or the rocker cover is not tall enough



#4 nicklouse

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Posted 13 September 2019 - 09:21 AM

as suggested above the rockers could be touching the cover.

 

so does it make the noise with the cover off?



#5 dmandan

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Posted 13 September 2019 - 12:58 PM

they're brand new from minisport have had a good look at the inside of the cover and no noticeable marks



#6 dmandan

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Posted 13 September 2019 - 12:59 PM

it would leave marks if they were fouling the lid right?



#7 MiniMadRacer

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Posted 13 September 2019 - 01:41 PM

As Nick has suggested run the engine with the cover off for a few minutes.. oil will NOT be splattered all over the place while you do this.. if its still noisey put a long screwdriver on a non moveable part of the rocker gear near each moveable rocker with your ear near the handle end of the screwdriver, and you should be able to narrow down which rocker is likely to be making the noise 



#8 nicklouse

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Posted 13 September 2019 - 03:40 PM

it would leave marks if they were fouling the lid right?

hardly any marks.



#9 nicklouse

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Posted 13 September 2019 - 03:40 PM

they're brand new from minisport have had a good look at the inside of the cover and no noticeable marks

 are that might be your problem.

 

also some are just louder than others.



#10 dmandan

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Posted Yesterday, 09:41 AM

So noticed the tappet is pretty quite when i start the engine then grows louder as the engine warms up, would suggest a tight tolerance sopmewhere that's only causing noise as metal expands right?



#11 dmandan

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Posted Yesterday, 11:53 AM

it's definitely not the rocker box as the noise is there with this removed, it's coming from valves 8 & 1 but i redid the gaps and pretty sure they're right (having redone them about 100 times already)

 

possible cam issues maybe?



#12 MiniMadRacer

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Posted Yesterday, 12:23 PM

If you grab the 1 and 8 rocker when its at TDC and you would normally adjust each one, can you twist it from left to right or indeed pull it left to right... noisey 1 and 8 would suggest badly shimmed / spaced rockers at the end of the shaft allowing them to float up and down the shaft a bit (If that makes sense)






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