Tappet adjustment query

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David Tew
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Tappet adjustment query

Post by David Tew » Sun Oct 28, 2018 6:57 pm

There are several types of roller rockers. Mine are Yella Terra Steet with screw-in studs (and yes, I did fit them both sides! :) ). I think Jim's are Yella Terra Pro, the posh ones.
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Tappet adjustment query

Post by spegru » Fri May 03, 2019 11:55 am

I've now had several goes at adjusting my tappets but it's still quite noisy. But I'm new to these engines so I don't really know what to expect. It's all standard as far as I know
A video link from drop box will let you hear.. (i wonder whether this will work...)

https://www.dropbox.com/s/00nr5mne9maov ... 4.mp4?dl=0

Is this normal?



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Tappet adjustment query

Post by peter freeman » Fri May 03, 2019 1:37 pm

I have heard worse but the engine seems to be revving quite high - how loud are the tappets at tick over and have you checked the rockers are flat and if you have anything but a standard cam fitted then the tappet settings can well be "loose". MY friend has a tuned engine fitted and it rattles like hell - but goes like hell as well



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Tappet adjustment query

Post by spegru » Fri May 03, 2019 4:54 pm

Idle speed a bit high possibly.It sounds no better at lower idles speed though.
Whole engine is standard as far as I know. I'm not sure what you mean about flat rockers?

All adjusted using feeler gauge and making sure to wiggle the tappet to get max clearance.
Sounds a bit like one tappet on the right bank although it's hard to be sure about that. I've wondered about wear on the tappet nose
I also wondered whether the noise could be the infamous cam gear? I've never looked at it



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Tappet adjustment query

Post by Coupe Racing » Fri May 03, 2019 5:32 pm

The only way to be sure is to remove the rockers and inspect the contact surfaces .
Otherwise it would be a worn follower .
I've had them break and the engine still ran


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Tappet adjustment query

Post by peter freeman » Fri May 03, 2019 5:37 pm

Sorry about he quick and out of scale drawing. R is the rocker V is the valve stem and F is he feeler gauge. I hope you can see the feeler is not measuring the true gap between the valve stem and rocker but the gap between the two if they were flat - I hope you can get the general idea even if its way out of scale.
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Tappet adjustment query

Post by Roger Pennington » Fri May 03, 2019 6:52 pm

Have you tried the old trick of resting a piece of wood or a long screwdriver against the rocker cover, then pressing your ear to the other end, and listening? In effect making an improvised stethoscope, it can help to isolate where a sound is coming from.


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Tappet adjustment query

Post by TrevorG » Fri May 03, 2019 7:26 pm

My racing bikes had so little room to check the valves, I created a set of really narrow feelers (ground down from an original) to set the clearance.....further complicated as they were adjusted by shims, not a screw. But it may be worth doing as thin feelers will follow the contours.
I used a good set of feelers and clamped them all together before grinding down all together before smoothing off the rough edges on each seperately.



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Tappet adjustment query

Post by james couper » Fri May 03, 2019 9:01 pm

To get the engine to run more smoothly / quieter, you need to set the SE6A plug cap 0.75 mm, points to 0.64 mm, reduce the idle speed to 800 rpm, then check the timing is still OK, setting everything up correctly can make a big difference, valve clearance for SE6A is Exhaust 0.50 mm (hot) Inlet 0.35 (hot). Also carburettor has to set up correctly, too much fuel can cause fuel to be burnt in the exhaust causing extra noise.



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Tappet adjustment query

Post by spegru » Sat May 04, 2019 9:10 am

Thanks for those. I'm aware of the possible uneven wear situation (that diagram pretty good actually). I used to run A Series Minis and there was this automatic adjuster that relied on the thread pitch to get the true gap, but it doesnt seem to work for these engines because the adjustment is only on a single nut rather than a screw and lock nut. I do wonder if the approach might be copied though, winding the nut down to zero (if that can be judged by hand) and backing off a number of turns, calculated based on the thread pitch. Might be worth a go in conjunction with that wood stethoscope idea.
Not checked plug gap tbh but they are new plugs. I altered the points gap recently to 0.5mm which was a figure I found somewhere, and set the timing accordingly. Might be worth taking another look at that



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Tappet adjustment query

Post by derekoss » Sat May 04, 2019 9:31 am

A dial indicator on a magnetic stand takes care of everything.

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Tappet adjustment query

Post by scimjim » Sat May 04, 2019 9:38 am

There are a few different figures in different books for Essex valve clearance - some are simply rounding errors, others refer to the earlier camshafts. I use 12 & 20 thou (cold) on standard cams.


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Tappet adjustment query

Post by rebel alliance » Sat May 04, 2019 9:51 am

Just remembered i still had one knocking about..Now to make a bracket 😊
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Tappet adjustment query

Post by spegru » Sat May 04, 2019 12:40 pm

What a very good idea. I think I may even have one of those



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Tappet adjustment query

Post by james couper » Sat May 04, 2019 2:34 pm

The figures i quoted are from a original Reliant manual that came with my SE6A the plug gap of 0.75 mm is quoted in the later supplement that came from Reliant. I have played around with different settings from different manuals some from Ford and i have always revert back to the Reliant figures as these i have found are the best for the SE6A.



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