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t160 tappet adjusters
#707515 09/06/17 5:34 pm
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is there a way of changing the adjusters for new ones without taking the boxes off, of course they wont screw out from the top

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Re: t160 tappet adjusters
lace remington #707526 09/06/17 7:15 pm
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Hi Derek,

Originally Posted by lace remington
is there a way of changing the adjusters for new ones without taking the boxes off,

'Fraid not.

Hth.

Regards,

Re: t160 tappet adjusters
lace remington #707551 09/07/17 12:36 am
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Actually, you can, but the time it would take to make the special tool that you need to depress the valve so you can take the adjuster out the bottom of the rocker would take more time than removing the rockerboxes.
The tool looks like a J with a link bar near the bottom of the loop.The short end of the J is put under the top of the rockerbox and the link bar sits on top of the spring keeper. The long arm of the J is pulled to depress the valve. It has to be fairly stout as the seat pressure is about 90 lbs closed and 195 lbs open.
A rubber band looped around the end of the rocker and one of the head bolts keeps the pushrod on the ball end of the rocker.
Not much room in there. A pair of forceps would help to unscrew the adjuster.
If you remove the rockerboxes be sure to loosen all the head bolts to about 5 ft-lb evenly then remove each rockerbox, remove the adjusters and reinstall before removing the other rockerbox.

Re: t160 tappet adjusters
lace remington #707867 09/09/17 10:44 pm
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Go on Dave i'll bite. Why do you have to slacken the head bolts to take off the rocker boxes?


1971 BSA A65 Lightning "Bitsa"
1966 BSA A65 "Beezuki" with GT550 two-stroke engine
1974 Triumph T150 830cc
1975 Suzuki GT550
1975 Laverda 1000 3C
1986 Yamaha SRX 600 X 2
Re: t160 tappet adjusters
lace remington #707872 09/09/17 11:56 pm
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There are four head bolts across the rockerbox plus two outboard studs on each side. Removing one or both rockerboxes without slackening the other head bolts will warp the head due to the uneven clamping. Plus, it will probably break the head gasket seal.
When installing the head the bolts are torqued evenly and in sequence around the head. Taking it off requires the same operation.

Re: t160 tappet adjusters
DMadigan #707908 09/10/17 9:43 am
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hi dave, maybe you could post the sequence of removing the boxes for me, and I will give it a try, or better still if anybody lives near me they could help me, the kettles always on. regards derek. Sale Cheshire.

Re: t160 tappet adjusters
lace remington #707953 09/10/17 9:01 pm
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1971 BSA A65 Lightning "Bitsa"
1966 BSA A65 "Beezuki" with GT550 two-stroke engine
1974 Triumph T150 830cc
1975 Suzuki GT550
1975 Laverda 1000 3C
1986 Yamaha SRX 600 X 2
Re: t160 tappet adjusters
lace remington #707954 09/10/17 9:04 pm
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If you are going to work on it you should get a manual.
Remove the head steady braces and oil feed line from the rockerboxes.
Open the valve covers and slacken off all the adjusters as far as you can.
Remove the three 1/4" screws at the lip of the valve pockets and the two at each end of the rockerbox on top.
Back off all the 5/16" head bolts a quarter turn at a time until they are at about 5 ft-lbs. Leave the outer four stud nuts and remove the rockerbox bolts.
The rockerboxes are not doweled but they should be to keep them from walking about. This requires removing the head.

Re: t160 tappet adjusters
DMadigan #707955 09/10/17 9:16 pm
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Dave,

Looking at the manual I see what you mean, the head studs hold the rocker boxes down. Three questions though, you think that 5 ft/lbs on the four outer studs is enough to keep the head gasket seal, how do you measure 5 ft/lbs when you are slackening the nuts, and you have a torque wrench that reliably measures 5 ft/lbs? I suppose it must all work as you'll have done it enough times.


1971 BSA A65 Lightning "Bitsa"
1966 BSA A65 "Beezuki" with GT550 two-stroke engine
1974 Triumph T150 830cc
1975 Suzuki GT550
1975 Laverda 1000 3C
1986 Yamaha SRX 600 X 2
Re: t160 tappet adjusters
Peter Gascoigne #707977 09/10/17 11:49 pm
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Measure the 5 ft lbs with an in lb torque wrench (60 in lbs)


Gale Gorman
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1974 Triumph Trident
1983 BMW R100S
Re: t160 tappet adjusters
GaleGorman #708011 09/11/17 7:44 am
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Hi Derek, Peter, Gale,

Originally Posted by Peter Gascoigne
5 ft/lbs on the four outer studs is enough to keep the head gasket seal, how do you measure 5 ft/lbs when you are slackening the nuts, and you have a torque wrench that reliably measures 5 ft/lbs?

Originally Posted by GaleGorman
Measure the 5 ft lbs with an in lb torque wrench (60 in lbs)

Like 'prt seal crush', because Dave dared to post an actual figure isn't a reason to overthink this - it doesn't matter whether the figure is 4 ft.lb., 5 ft.lb. or 6 ft.lb., what matters in Dave's method is keeping a little tension on the outer head bolts.

Fwiw, I've done the procedure outlined by Dave numerous times, usually simply to change a leaking rockerbox-head gasket; when doing this, I've only ever removed the 5/16"UNF bolts or studs through the given rockerbox and haven't noticed any warping of the head.

If you have to remove both rockerboxes - if changing the tappet adjusters, say - don't bugger about, just undo all the head bolts as directed in the manual, dissemble, change or anneal the head gasket along with whatever else you need to do and reassemble; life really is too short to agonise over how much tension to keep on a couple of triple head bolts ... smile

Hth.

Regards,

Re: t160 tappet adjusters
lace remington #708022 09/11/17 12:14 pm
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ok thanks everyone, got all that, all sounds a bit daunting to me though, I might try a small cutting disc first and see if I can dremmel the bottoms off the adjusters, and screw them out, might just work. everything is oil tight up there, so It might be best to leave well alone. lace.

Re: t160 tappet adjusters
lace remington #708042 09/11/17 3:53 pm
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If you do that you need to find a way to keep the dust from getting on any of the engine parts, especially down around the valve springs as there is an oil drain at the bottom. That dust will destroy the oil pump. Any getting into the pushrod tubes will go down to the tappets and cam. It is not that hard to seal the top end. Also the rubber seals do not last forever so they will have to be replaced sometime.

Re: t160 tappet adjusters
Stuart #708058 09/11/17 5:52 pm
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Hello Stuart,

Whats 'prt seal crush?

Peter.


1971 BSA A65 Lightning "Bitsa"
1966 BSA A65 "Beezuki" with GT550 two-stroke engine
1974 Triumph T150 830cc
1975 Suzuki GT550
1975 Laverda 1000 3C
1986 Yamaha SRX 600 X 2

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