New cam followers on old camshaft

[winabbey]

Following on from Spider's description of the cam followers surface finish and rotation here's an excellent article by Keith Calver's engineering "twin" in Australia, Graham Russell.

https://russellengineering.com.au/camshaft-followers/

[Peter Laidler]

Great thread here, started by Surfari and answered once and for all by the tech response from Spider Chris and the pictorial article put up by Winabey. Brilliant......, warms my heart up on a miserable crap rainy day here. A good example of how a couple of pictures save thousands of words. Or how during a written technical examination, a drawing of a mechanism can answer a question in a quarter of the time AND get good marks

I have sent the thread to a good friend of mine who still teaches pre-uni Engineering students. Brilliant.....

[mini_surfari]

Just to follow up on this, here is one of the eight followers received back from Keith (CalverST).

Will bed them in using the standard procedure.



Also, what happened to mega cheap 20w50.. Wilko used to be our go to for running in

[AndyB72]

Also, what happened to mega cheap 20w50.. Wilko used to be our go to for running in

Was thinking the same thing. I need some cheap oil to chuck into a freshly built engine/box for a few miles. Called in my local MDC, no 20/50 at all, gave the guy my reg number "computer says no". Had a nosey on Hellfords website and looks like they don't do 20/50 either. If you find any let me know.

[63monte]

“Was thinking the same thing. I need some cheap oil to chuck into a freshly built engine/box for a few miles. Called in my local MDC, no 20/50 at all, gave the guy my reg number "computer says no". Had a nosey on Hellfords website and looks like they don't do 20/50 either. If you find any let me know.”

Not sure what the problem is with finding 20/50, there’s plenty about.

DB4518A3-6A71-4662-A287-5CEC2BD47823.jpeg

I’ve just used the Millers in mine.

[Exminiman]

This is good, and you are supporting a business that specialises in classic
minis

https://www.minispares.com/product/clas ... 7005T.aspx

DD32445B-D7FE-4348-87A8-B2606D7A7FB3.png

[AndyB72]

I was referring to the mega cheap stuff Wilko, Asda, Morrisons etc. used to sell.

[AndyB72]

I’ve got plenty of the Mini Spares oil, but I feel it’s too good to use as an initial flush or running in oil.

[mini_surfari]

I was referring to the mega cheap stuff Wilko, Asda, Morrisons etc. used to sell.

Just found this Andy…

https://www.amazon.co.uk/Comma-XFMOT1G- ... th=1&psc=1


And agree with you, we’ve plenty of good quality oil on the shelf!

[peasantslife]

Think I've covered this several times previously. What makes you think that the viscosity index is vaguely important? Its not really relevant at all for 99% of classic driver usage.
No load engine run-in can be done without ZDDP additive, but for driven usage that part of the add mix is by far the most significant for a gearbox in sump engine.
20W is only of any interest if you are cranking your car into life below 5C daily (I'll suggest..) and then only has any significance for the first mile or two of usage when you will be able to measure a small fuel economy benefit.
Any mini tucked away between Haloween and easter can run entirely well on a strait if it has ZDDP to manage gear shear. However ZDDP is virtually unheard of nowadays in ANY commercially available motor oil as its a guarantee to cat killing.
So, look at the back of the can and look for API SC, SD, SE grades as they are probably the most appropriate for your classic mini.
Oil, the least understood and probably most complex component installed in an engine - (any machine).

[Spider]

If it's a fresh engine build, I'd suggest a Running In Oil. Penrite (available in the UK) do an excellent one. Yes, it's a 15W40 but for break in, I wouldn't go any heavier.

If it's just new cam followers (and a cam ?) then again, I'd go for a 15W40 for their break in too. Going to a heavier Oil here just won't help matters and you'll be more likely to scuff them up.

[Exminiman]

I was referring to the mega cheap stuff Wilko, Asda, Morrisons etc. used to sell.

Just found this Andy…

https://www.amazon.co.uk/Comma-XFMOT1G- ... th=1&psc=1


And agree with you, we’ve plenty of good quality oil on the shelf!

Its cheap, but it is only 4.5 litres not 5

[Spider]

Following on from Spider's description of the cam followers surface finish and rotation here's an excellent article by Keith Calver's engineering "twin" in Australia, Graham Russell.

https://russellengineering.com.au/camshaft-followers/

Hehehehehe,,,,,,,I had to have a it of a chuckle at this,,,,

The cam follower that was in my previous post;-

Just coming back to having follower re-faced and breaking through their hardness boundary layer, here's an extreme example;-



It's clear that it had been rotating but was far too soft. Needless to say, it chewed out the cam.

Was actually one of his,,,,

Just be careful when turning to re-faced followers. I'd suggest, if there's any doubt replace them with the likes of APTs or Isky's.

[Exminiman]

Following on from Spider's description of the cam followers surface finish and rotation here's an excellent article by Keith Calver's engineering "twin" in Australia, Graham Russell.

https://russellengineering.com.au/camshaft-followers/

Hehehehehe,,,,,,,I had to have a it of a chuckle at this,,,,

The cam follower that was in my previous post;-

Just coming back to having follower re-faced and breaking through their hardness boundary layer, here's an extreme example;-



It's clear that it had been rotating but was far too soft. Needless to say, it chewed out the cam.

Was actually one of his,,,,

Just be careful when turning to re-faced followers. I'd suggest, if there's any doubt replace them with the likes of APTs or Isky's.

Do you know what the manufacturing process is ? presumably case hardened and then machined ?

[Peter Laidler]

Interesting question....... I'd say machined THEN case hardened appropriately and then polished. By always prepared to be shot down........

[winabbey]

According to the engineering drawing for cam follower part 2A13 they are cast steel with hardened HRC45 faces, whatever that means.

[Exminiman]

....bit like other surface treatments may depend on the depth of the treatment ?

[Ronnie]

Rockwell Hardness > https://www.bing.com/search?q=hrc+45+ha ... ghc=1&lq=0