Ti Tappet adjustment

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td99
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Ti Tappet adjustment

Post by td99 » Fri Mar 17, 2017 8:08 pm

I've done mine a couple of times, but the tappets still sound like a sewing machine.
What's best, hot, cold....
How hot is hot?
Last time i did it hot-ish with a dial gauge as I don't trust feeler gauges when surfaces may not be flat, but still a loud ticking noise.
Wondering if it's an effect of the autosprint cam as it was quieter before that...
Recommendations?


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Re: Ti Tappet adjustment

Post by Oaksey » Fri Mar 17, 2017 8:19 pm

Are you using the standard Nissan gap values? Most cams have different gaps so maybe the Autosprint one is the same?


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Re: Ti Tappet adjustment

Post by CNHSS1 » Fri Mar 17, 2017 8:27 pm

Autosprint or Piper cams will be a tad noisier as they are a regrind so the pitch circle diameter is smaller making the lobe more pointed. The Autosprint has a trick asymmetric profile meaning the backside of the lobe is almost flat. From memory stock can is 12thou and Autosprint and piper was 10 thou


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Re: Ti Tappet adjustment

Post by td99 » Fri Mar 17, 2017 8:37 pm

CNHSS1 wrote:Autosprint or Piper cams will be a tad noisier as they are a regrind so the pitch circle diameter is smaller making the lobe more pointed. The Autosprint has a trick asymmetric profile meaning the backside of the lobe is almost flat. From memory stock can is 12thou and Autosprint and piper was 10 thou
Now that could be the answer, there was no specific gapping info sent with the autosprint cam...so I used std settings.
Thanks, I'll try that...


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Re: Ti Tappet adjustment

Post by td99 » Wed Mar 29, 2017 6:58 pm

Well, I also contacted Autosprint who also said "from memory" and gave 8 and 10 thou cold. Which is the same as in the big red book and Nissan book.
I've found that my problem came from the use of a dial gauge, whereby the strength of its spring plunger caused the mounting to bend ever so slightly - giving a greater gap at the required measurement. Back to feeler gauge (never liked them due to experiencing curved wear and thus difficult to measure in my old fords, but the Nissan setup is much better and can be measured easily...)
It's much better now, but still one of the little b***grs ticking louder than others...


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Re: Ti Tappet adjustment

Post by reliant-reviver » Thu Mar 30, 2017 7:18 am

Bridging is a problem on tappet setup that can be overcome by determining the amount of turn on the adjuster to a certain clearance.
then wind them up till they bind and work back from there.

This was the only way i found to get quieter tappets on old worn reliant OHV engines.


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