Yep a buggered lifter or push rod can cause a bad rattle. Usually comes with a buggered cam shaft

I hope its an issue with the top end.

Have a look at the top of the valve. Is there any mushrooming of the valve stem.

Hmmmm I wondered that might be replacing rod and said lifter. But will pull valves out as well for inspection

Thats not ideal

I was going to say that. Is it the rocker hitting the cover? You will have this sort of problem with those newer alloy rocker covers, it p#ssed me off so much I went back to an original cover.

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Lillee - 1969 Morris Mini K

Simon, that extra `washer' is the keep plate for the rocker shaft grubscrew.
I think perhaps late motors had nyloc nuts on the 4 little studs, I've seen them on quite a few.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks guys all your input is appreciated. Off to buy a valve spring compressor today

Nah i roll an original rocker cover

If you want a secondhand one I have a few mini specific ones.

Pm me I will do a fellow kiwi a good deal


Cheers

Kiwiinwgtn

aaaw bro! I just gone and bought one today, i should of checked back here first! oh well thanks for the offer any way mate

No worries.

Fingers cross you get to find what the issue is.

Kiwiinwgtn

just pulled the exhuast valve from pot 1......yep! its bent it wouldnt slide out nicelt like it should could this be the culprit?

Valves do mushroom on the end.

I usually use an oil stone to debur the top of the valve before I try and push it thru the guide.

They should just push out by hand with little resistance.

To check to see if its bent see if will roll easily on a glass table top. Or use a straight edge.

Hopefully the valve will have a mark on the stem showing you have found the issue

When it happened on my car the valve guide grabbed the valve which wore the guide.

With the valve out does the guide look round

I am sure I posted a pic of my buggered valve guide in one of my posts

Kiwiinwgtn

ok ill get a photo up when i get a spare moment.
i also removed exhaust valve from pot 2. iy glided out sweet then i inserted into the guide on pot 1. it went in nice too .on the bent valve there is a polished rub mark on the stem . the guide appears to be ok but i could be wrong

After fighting with windows 8.1 I managed to enlarge the pic and No7 rocker arm/cylinder 4 inlet is hitting the washer on the rear stud. The others look pretty close too.

RonR

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68 build Mk1 Cooper S
72 Clubman GT project. Total restoration required

The guide is the issue. They grab the valve, piston comes up and whacks the valve,

I would check all the guides. Replace it. I bet it is oval