6 cylinder rocker shaft end caps, removal

[Pete Lewis]

if theres a ridge in the wear pad  just reduce it  with a stone , keeping the contour. of the pad 

yes the pads do wear to a bedded in condition but takes a lot of running  as the rocker rubs over the stem tip.

nothing wrong with doing an odd check now and then 

 

[daverclasper]

Cheers Pete. Your knowledge, practical advice. Brill.

Dave 

[Pete Lewis]

Dave  there is utopia or compromise

 If its fomula 1 then utopia is the only option  when its 50 year old triumph    then a compromise to a working condition is king

Theres a balance based on  the costs and anticipated milage  little point in a  £5k engine rebuild and do 500 miles a year 

Spend £100 on rockers and get 20,000miles on the clock is a  more sensible option

[daverclasper]

Hi. Have dismantled old shaft. Only one rocker seemed really bad so will replace that. Do I have to screw the adjusters in a bit to allow for the new shaft not being worn, before I fasten the pedestals down?. Of course I will be checking valve clearance's before I start it.

One other thing, the WSM says there is a rattle proof washer for the Pozi screw that goes through oil feed pedestal, into shaft. mine didn't have one. the screws pretty beveled below the head so does a flat washer crush to that shape when tightened?. Shall I just make sure screw is pretty tight?.

Also my shaft is blanked off at each end, so think it's ok to just to use split pins?.

New shaft is about 1mm longer than old shaft, I'm guessing rocker cover will still have plenty of room, also a couple of the oil flats have been machined to only just within the sides of the rockers, in there position on shaft (well it was only £25), so hope that's ok.

Any further advice great please.  

Thanks, Dave 

Edited August 31, 2018 by daverclasper

[Pete Lewis]

Flat washer wont work  best to use a loctite and do up tight with a correct fitting screwdriver think its a no3 posidrive 

But by age it may be  a  phillips   both look similar as a cross head  but angles are very different 

The conical washer would be an external star shakeproof 

Pete

[daverclasper]

Cheers Pete, other things I mentioned not an issue then.

Cheers, Dave

[daverclasper]

Thanks so much folks. New shaft fitted and oil now running out of all rocker top holes.

Dave

[Pete Lewis]

there you go, more time on the forum than doing the job   Ha !   ...brilliant glad its all come together 

[daverclasper]

That's me, Mr anal. One more pedantic question please.  I marked the pushrods with a spot of white paint to see if they are turning. All are doing complete revolutions except one that is turning back and forth. Ok I guess?.

Dave 

[Pete Lewis]

dave its the cam follower that rotates the push rod ,  the follower is lightly offset to the centre of the lobe so any lift makes it rotate

its not rocket science , this may be just general wear on the cam or the follower contact surface, 

a bent pusrod can make a similar back and forth motion 

look at that but not overly anything to worry about 

Pete

[daverclasper]

Thanks Pete.  I didn't make a note of which rod it was (should have been more anal!), though maybe was no 4, which was the rocker that had most wear in the bore and on the pad and corresponding area of shaft.

I guess the push rod can be removed to check straightness by valve in closed position and screwing in the adjuster?.

Sorry, another question.

Dave 

 

[Pete Lewis]

Theres a chance it will come out by fully de adjusting but some need the shaft lifting 

Wait till there's nowt else to do 

Pete

[daverclasper]

Ta. Sorted. Bottom of the never ending little things to do list

Dave

[Pete Lewis]

 not  saved for a rainy day we dont want that back yet 

Pete

[daverclasper]

Hi. Before I replaced the very worn shaft, my valve gaps were stable over 1000's of miles. Car has now done about 3000 since new shaft and seems to be getting progressively more tappety. Sounds like more than just one cylinder. Could this down to old rockers bedding in to new shaft (hopefully new shaft isn't like cheese and wearing quickly).

Cheers, Dave

[Pete Lewis]

I would hope its the rocker refacing its wear pattern due to the shaft having better control over the rockers action

 and thats   a bit of a thought  rather than a  reason

Pete

[daverclasper]

Thanks Pete. Fingers crossed. I meant to write 300 miles, not 3000.

Dave

[Pete Lewis]

Its only a 0   no worries

Do a reset and see how they go ,  

Lets call it settlement ,   covers a multitude of ideas

Pete

[Pete Lewis]

not to worry too much but i have a local who used a reputable local engine shop to face and cut the valves seats and fit a new shaft

first they lost 6 of the lower spring cups, (very rare to find)then chucked all the numbered pushrods in a trico tank all mixed up, refitted the collets and had one jammed in the top cup which ended up locking the hand engine turning and bent a pushrod, chucked the supplied mills pins and fitted ..the split pins instead....you just cant get the best feeling when all this goes wrong , and its been paid for .....diy.... if goes wrong its only you to blame 

put your beloved in the hands of professionals and all heck breaks loose

pete

[Gully]

17 hours ago, daverclasper said:

Hi. Before I replaced the very worn shaft, my valve gaps were stable over 1000's of miles. Car has now done about 3000 since new shaft and seems to be getting progressively more tappety. Sounds like more than just one cylinder. Could this down to old rockers bedding in to new shaft (hopefully new shaft isn't like cheese and wearing quickly).

Cheers, Dave

If it's any consolation, mine was the same. Reset the clearances after around 500 miles and they've stayed quiet. I also checked with a torque wrench that the pedestal nuts were still tight after a number of heating / cooling cycles.

Gully

[daverclasper]

Thanks

Only used "professionals"three times in my life when I had less experience and all were unbelievably bad through lack of skill/knowledge. In all cases I ended up sorting it myself after doing research.  I must have been unlucky as there will be good mechanics out there.

That is hopeful Gully,  cheers.

Dave