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valve clearances #711435 10/13/17 5:19 pm
Joined: Mar 2011
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lace remington Offline OP
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t160... running rough, checked and reset valve clearances, 5 ok, but can't get a gap on one of the exhaust ones with the adjuster screwed out as far as it will go? just a slight twitch up and down movement on it, any ideas. thanks

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Re: valve clearances [Re: lace remington] #711439 10/13/17 6:32 pm
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edunham Offline
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Sounds like the valve stem is coming up to high. That could be an incorrect valve (too long), an incorrect pushrod (too long), a pushrod that isn't seated correctly in the cam follower, or the valve is pocketed. If the valve is pocketed, the options are installing a new valve seat (expensive and fraught with peril) or installing an oversize valve. You may be able to cut down the valve stem. I have never tried that. If so, you may need to cut it down enough to use a lash cap. Don't know if there is enough room.
First thing I would do is take off the inspection cover for the pushrod and see if you can determine whether the pushrod is seated correctly. You may not be able to without taking off the rockerbox.

Ed from NJ

Re: valve clearances [Re: lace remington] #711448 10/13/17 8:01 pm
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htown Online Content
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I believe the t160 has the rocker arm that has the captive half sphere on the bottom against the valve tip. This may have rotated out of it's correct position and locked against the valve. I had one that the sphere had broke in half and was wedged in there.


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Re: valve clearances [Re: htown] #711824 10/17/17 5:41 pm
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lace remington Offline OP
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decided to do a top end rebuild on the t160, it's at the stage now where it all needs doing properly. could anyone give me a breakdown on all parts that will be needed for ordering thanks.

Last edited by lace remington; 10/17/17 5:43 pm.
Re: valve clearances [Re: lace remington] #711904 10/18/17 2:21 pm
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lace remington Offline OP
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ok, no takers but, what do you reckon,

top end gasket set
valve spring set
inlet/exhaust valves
tappet adjusters and lock nuts
valve guides / and oil seals

have I forgot anything? regards LR

Re: valve clearances [Re: lace remington] #711910 10/18/17 3:14 pm
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DMadigan Offline
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You will not know what you will need until the head is inspected. If you are not using a copper head gasket that will have to be replaced. I do not use paper/fibre gaskets but instead use Loctite Gasket Eliminator. Copper can be annealed and reused if not damaged.
Measure the valve springs with a spring gauge. You most likely will not have to replace them.
Look at the valve tips to see what wear the stock adjusters are causing. The T160 "Ducati style" adjusters are better than the original R3/T150 type. I prefer the EF adjusters because they cover the entire top of the stem. Any spherical tip adjuster has a point contact which cannot be supported by an oil film so the surfaces must be hardened to reduce wear.
Measure the valve stems and guides to see if they need replacement
You will have to remove the guides and measure the holes in the head before ordering guides in case oversize guides are needed.
Whilst everything is apart you might consider grinding the excess material off the rockers to reduce loads in the valve train.
Once the valves seats are ground you will find out if the rockerbox has to be raised, pushrod shortened or the valve tip trimmed to get the rocker movement correct. Install light springs on the valves on a lightly tightened top end with no pushrod tubes and turn the motor over to measure the movement.
Check the spring collar to seal clearance to be sure there is no interference.
I counter bore the three 1/4" screw pockets at the lip of the rockerbox valve pockets for button head screws. They have more area under the head for sealing and reduce crushing of the holes.
If you are using stock rocker covers you can counter bore the holes of the female socket bolts to put in an O-ring for better sealing without bending the cover.
You will need new aluminum seal washers for the oil lines banjos..

Re: valve clearances [Re: lace remington] #712037 10/20/17 5:01 am
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O rings for the rocker spindles.


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