27 replies to this topic

[AndyMiniMad.]

It might help to get it torqued fully and check the end float on the cam again...

[grahama]

Sorry Andy,

I posted a bad description, no to finger tight, just checked it again torqued up, 11 tho.

If a new retaining plate does the trick, how does it work?? Could the new gasket be the problem, I would expect that it would only add 1 tho though !!


However I have just measured the uncompressed garket thickness and it is 34 tho !!! Seems a little thick, would a thinner gasket solve the problem ???

Edited by grahama, 20 February 2012 - 09:56 PM.

[Pigeonto]

That's how it came !! The one I took off didn't have it but hey ho should be fine if going in the right direction.

I don't understand what to get machined ?? If I take material off the sproke twont it will make the gap larger ???

How do I do this??

Its a job for a lathe.Material is removed from the part of the sprocket which contacts the end of the cam when the nut is tightened. as I recall the sprocket is reduced in that area and that part of it is like a thin ring

[AndyMiniMad.]

Yeah! some gaskets are a wee bit thicker than others, but your end float is huge. so I dont think the gasket is your problem..Is the back plate ok? Was it a new cam? yes a new cam retaining plate might help if the old one has been worn by the rotation of the cam..

[dklawson]

You asked (indirectly) about what variables do to affect the endfloat. Start with the cam. It has more-or-less a flat front. from memory, the sprocket has a small boss that extends THROUGH the triangle plate and rests on the front face of the cam. All the endfloat is controlled by the thickness of the triangle plate and the height of the little boss on the cam sprocket. If the plate is new and thicker... there is less endfloat. If you machine a tiny bit off the boss on the sprocket, the shoulder on the sprocket moves closer to the triangle plate and closes the gap.

Start with a new plate. It is safer than messing with the thickness of the gear.

(5 new posts while I tried to complete this one lously reply. I shouldn't try to post while at work!)

EDIT: Gasket thickness does not influence cam endfloat. As mentioned earlier, by Pigeonto, the gear has a thin boss on it that extends through the triangle plate and touches the front of the cam. It's just the triangle plate and boss on the gear that control endfloat.

Edited by dklawson, 20 February 2012 - 10:00 PM.

[Pigeonto]

No, torqued up to 65 lb/ft, the locating plate looked a 'little' worn but I don't see how a thicker / new one would help!! Shims over the end of the cam would take up the slack, but can't find any !!

Graham

If shims were added between the cam and sprocket the end float would increase.Save your shimming for the very last job after you have corrected the cam end float,that is use shims to get the bottom sprocket perfectly in line with the cam one.

[grahama]

ok, many thanks as usual for your patience.

As a last resort I turned the triangle plate round, doesn't fit but got a bolt in to see how the sproket sat, and the end float. It has improved dramatically so I think a new plate is in order.

For the life of me I can't see how a thicker plate would work, maybe just too tired to think now, not usually this thick mechanical wise lol, but I will work it out, a diagram would be good if someone can help me out.

Graham


Sorry think I have got it, a thicher plate will allow the nut to push the cam further back into the block, taking up slack, a thinner plate will leave slack as the 'extra' bit on the sproket can't push the cam back properly when the nut is done up. Probably very badly explained but I get it now, Phew !!!

Edited by grahama, 20 February 2012 - 10:46 PM.

[Pigeonto]

I wish I was computer literate enough to do diagrams,would be very useful.The only suggestion I could make to help you clarify the situation is, with a camshaft out,fit the triangle plate and sprocket and tighten the nut up.It will be clear just what the relationship of the plate is to the end float and how a thicker one would alter things.

[grahama]

Great idea, thanks, all coming out tomorrow to double check everything before I tighten down the head so will have a look.

[Pigeonto]

ok, many thanks as usual for your patience.

As a last resort I turned the triangle plate round, doesn't fit but got a bolt in to see how the sproket sat, and the end float. It has improved dramatically so I think a new plate is in order.

For the life of me I can't see how a thicker plate would work, maybe just too tired to think now, not usually this thick mechanical wise lol, but I will work it out, a diagram would be good if someone can help me out.

Graham


Sorry think I have got it, a thicher plate will allow the nut to push the cam further back into the block, taking up slack, a thinner plate will leave slack as the 'extra' bit on the sproket can't push the cam back properly when the nut is done up. Probably very badly explained but I get it now, Phew !!!

Hmmm, will be an interesting day for you today when it all suddenly makes sense!! you will also notice that,no, the cam wont get pushed further into the block by a thicker plate.The cam will always be pulled up to the block side of the triangle plate,even if the plate was a mile thick,the inside(block) face of it will always be hard against the backplate and the cam end bearing diameter will be there too.That is where the cam is designed to be to put the dizzy drive spiral gear in perfect line with the dizzy drive shaft and the cam lobes in the middle of the followers. The oil pump has a long enough tang to pick up its drive too.

[JVA10L]

On the clockwise / anti-clockwise question - wasn't there a Rover something with a Honda engine that rotated anti-clockwise?

[JVA10L]

Found some info on anti-clockwise engines, but still can't remember which British Leyland car used one.


http://www.ehow.com/...iclockwise.html

[Pigeonto]

The Kubota Z600 does although thats possibly a little removed from here. I dont know, has any one ever put one in a mini, 2 cylinder diesel 12 hp,hmmm