22 replies to this topic

[nicklouse]

You need to run new cam and followers at 2000rpm for 20 mins,
I use 20/50 VR1 and a small bottle of zddp zinc additive,

I would not add any additive to VR1 as too much ZDDP is as bad as not enough. VR1 has enough.

[cal844]

You need to run new cam and followers at 2000rpm for 20 mins,
I use 20/50 VR1 and a small bottle of zddp zinc additive,

I would not add any additive to VR1 as too much ZDDP is as bad as not enough. VR1 has enough.

I agree

[MIJ]

I used Halfords 20/50 for running in. Revs were kept up and run in for 500 miles. After 100 miles I dropped the oil and replaced with valvoline and have used since.

I take it 20mins at 2000rpm will.make no difference now?

[MIJ]

If it is the cam follower again. What should I do? Is it ok to leave and run? As long as I know what the rattle is and it wont cause damage I'm happy to leave as is.

[sonscar]

Ask this,where is all the worn metal going?passed through the pump may be filtered out till it blocks then into the crank?I would like to know what the damage is.Steve..

[Spider]

I used Halfords 20/50 for running in. Revs were kept up and run in for 500 miles. After 100 miles I dropped the oil and replaced with valvoline and have used since.

I take it 20mins at 2000rpm will.make no difference now?

 

My own view here is if you fitted new Piston Rings, you did the right thing by using Running In Oil to start with. I would have left it in for around 300 miles though, but even 100 would be OK. However, this only concerns the Piston Rings and not the Cam Followers. If new Rings weren't fitted or the Bores weren't honed, then there's no point in using a Running In Oil.

 

 

If it is the cam follower again. What should I do? Is it ok to leave and run? As long as I know what the rattle is and it wont cause damage I'm happy to leave as is.

 

Best to nail down exactly what the issue is, even if you have to go to a (reputable) shop and pay for their diagnosis. In the early stages, a worn Cam Follower can sound similar to a worn Rocker Shaft, but usually the Cam Follower will get worse and soon make more noise than the Rocker Shaft will. Either should be replaced, though you can possibly get away with a worn Shaft a little longer than the Follower.

In the case with the worn Follower, quite soon it will damage the Cam Lobe (and this may already be a cause if your Follower(s) are worn) and in the case of the Rocker Shaft, it will lead to Tappet Clearances that you can't adjust properly. When you get excessive clearance here, the Cam Follower no longer takes up all the Valve Train Lash on the very starting part of the Cam Lobe (Lash Ramp) but does so on the Opening Ramp that soon hammers the Follower and Lobes to death.

[MIJ]

Thanks all. It was all new. Rebore, new rings, pistons.

I know for sure that the rocker has play so could this may be the noise and I'm paranoid about it being the follower again..

I checked the tappet clearances just last week, none had moved much at all and
Were all consistent through out.

I recently had low oil pressure, although not alarming it was lower than previous. I have replaced the oil.and filter and pressure is back up to previous readings now.

[MIJ]

So after further investigation and standing and listening for a good while, I've come to the conclusion it is tappet noise. They are tick tick ticking, not excessive but I know the rockers have wear and also the valves have had use so all that combined I think is giving the noise. I also have S/C drops which I think are making the noise worse. When the clutch is depressed I can just hear the tappets.