Joined: Aug 2017 Posts: 3,392 Threads: 106
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Location: Darkest Bedfordshire
No, no and no again to Loctite and glue!
The front bearings are seldom tight in the casing even when cold and less so at running temperature. If they are firmly clamped between rear lip (either original alloy or steel replacement) and steel front cover there will not normally be a problem.
If they have been spinning chronically in the housing and destroyed it then apply an engineering solution (e.g. sleeve it or find a better casing).
Joined: Mar 2019 Posts: 23 Threads: 4
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Location: France
Car type: Nippy x 2
I've look at various suppliers web sites and can't see the bearing shims listed. Does anyone have a spare pair they are willing to sell me please ?
Joined: Aug 2017 Posts: 1,746 Threads: 42
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Location: Malvern, Victoria, Australia
04-04-2019, 10:28 PM
(This post was last modified: 04-04-2019, 10:29 PM by Tony Press.)
The front angular contact bearings are unlikely to turn in the alloy housing so no Loctite needed.
If as appears the two angular contact bearings have narrow outer rings in a deep housing then you must fit a 30 thou outer ring spacer front and back to correctly locate the crankshaft.
Joined: Aug 2017 Posts: 2,748 Threads: 31
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Location: Auckland, NZ
Curiously that engine number is for stepped a.c bearings? Has the replacement lip been placed correctly? All covered in Woodrow except that the diag A41 C is drawn wrong and does not depict the inner rings adding to 1 5/8!
Joined: Mar 2019 Posts: 23 Threads: 4
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Location: France
Car type: Nippy x 2
I see what you mean Tony. Yesterday I just fitted a shim under the outside bearing cover . It's gone up nice and tight, but maybe the crank is now pushed too far back as I only shimmed it one side. This can make a difference to where the oil jets line up I suppose. I better take it apart and fit a shim each side. Can someone please sell me a pair of the 30 though shims / spacers, as I have nothing suitable.
Joined: Aug 2017 Posts: 327 Threads: 1
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Location: Bristol
Before changing any shims check the conrods sit centrally in the pistons from underneath as a repair plate has been fitted. Terry.
Joined: Aug 2017 Posts: 952 Threads: 38
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Yes Terry, pretty much what I said in the other post relative to this.
Don’t want the Conrods hard up against the piston boss on one side
Joined: Mar 2019 Posts: 23 Threads: 4
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Location: France
Car type: Nippy x 2
I'll take the plates off again, as the rods aren't exactly in the centre of the bores. I was hoping someone would have a spare pair of shims to help me out, but I've had no response to my request.
Joined: Aug 2017 Posts: 2,748 Threads: 31
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Location: Auckland, NZ
As I understand it the crankcase should suit stepped a.c races so the problem is presumably due the repair cover being spaced wrong or the bearings modified wrong. You may only need one shim. Cutting shims is tedious even with a lathe. A motor reconditoner may have suitable old oil ring rails.
