In a message dated 96-09-15 10:59:20 EDT, you write:
<<
I'm ready to put the cam bearings into my TR4 block, but I'm a little
confused about the setscrews I see illustrated in the Moss catalogue. The
shop removed the old bearings without returning any screws to me.
Questions:
1. Did all the 4-cyl blocks use screws to retain the bearings?
2. Will I be able to fit the bearings in myself or will a machine shop
need to do it?
>>
John-
Yes, you will need the set screws. Without these the bearings can turn in
their bores (not good). When you install the bearings, do not force these
screws as they can ruin a bearing in short order. Pay special attention to
aligning both the screw holes and the oil feed holes. Any deviation here can
cause trouble. To install these bearings you will need to buy/make a fixture
that will slowly pull the bearing into the hole. What is needed is a stepped
piece that will fit into the bearing and catch the outer edge of the bearing
with the larger stepped area of the fixture (tool). Drill a hole in the
center of the fixture and mount a section of threaded rod. The rod should
extend past the end of the block so that you can put a large "washer" over
the camshaft hole and slowly tighten a nut on the end of the threaded rod so
as to slowly draw the bearing into place.
Now that you have decided that you can do this yourself, I suggest that you
have it done by a machine shop. The bearings supplied are often
"semi-finished", which means that they are thicker than the actual size
needed. When they are installed, they need to be align honed/bored to fit
each individual camshaft.
If you install the bearings yourself, and the cam doesn't fit in, or turn
easily, the bearings are semi-finished.
The Car Curmudgeon
Nick in Nor Cal
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