Hi Richard, Greg
A very knowledgeable Triumph engineer told me that invariably the large
journal Triumph engines will need the crank reground when they need the
shells replaced, to quote him, "by the time you realise the shells need
doing the crank will need grinding as well". The small journal Triumph
engines will often be OK even when you hear the bearings!
Small journal engines are I think all the four cylinder engines up to and
including the 1296 cc Herald / Spit engine.
Large journal engines are the 1498(?) cc and the 1296cc with the same
journals as the 1498cc As fitted to the Dolomite range, and possibly the
late 1300 Spits.
Cam journals are lubricated from the same galleries as the crank. The rear
cam bearing has a flat on it which meters the oil supply to the rocker gear.
It is said that the rocker feed supply kit can help to reduce the pressure
in the main bearings significantly if the rocker gear is badly worn, I don't
know how true this is as I would have thought the size of the holes for the
oil egress to the rockers would have been the restriction to create
pressure.
Graham,
1967 1300 FWD
1968 2000 Saloon
1972 2.5PI Saloon
1974 Sprinted Dolomite 1850
1975 Toledo in restoration!
http://www.triumph-iw.co.uk
http://www.mickdolphin.co.uk Spares Supplier.
----- Original Message -----
From: "Richard B Gosling"
| You may need your crankshaft re-ground to match new bearing shells.
|
| I'm not sure what the details of the camshaft lubrication in the Spit
engine
| are, but it is possible that worn bearings there could also contribute to
low
| oil pressure.
| Sorry not to have better news,
|
| Richard & Daffy
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