Page 98 - Vauxhall 20-60 H.P. (R Type) Chassis Shop Manual

VAUXHALL 20-60 SHOP MANUAL

INSPECTION ( After R 3060 )

SECTION – Examine pistons and cylinder bores as detailed in ( Section 439 ) .
440 The gudgeon pin should be a tight push fit in the piston. Holding the piston

in one hand it should be possible to push the pin through each bearing in
the piston with considerable effort. This is of course at normal temperature
( approx. 6o°F ). When correctly fitted and with the rod assembled, the pin
should be just tight enough to hold the weight of the rod in any position.

– Check connecting rod alignment.

TO RE-ASSEMBLE AND REPLACE ( Before R3061 )

SECTION – Reassemble pistons to rods, taking care to fit the circlips to the grooves
441 in the gudgeon pin bearings of the pistons correctly. If circlips are not

already fitted to the gudgeon pin bearings of the pistons, the treatment
should be carried out as detailed in Service Bulletin entitled ‘Engine Idling
Knocks’. Reassemble pistons and connecting rods to engine, reversing
operations given for removal ( Section 436 ).

TO RE-ASSEMBLE AND REPLACE ( After R 3060 )

SECTION – Reassemble pistons to rods with gudgeon pins correctly fitted, i.e., as
442 detailed in ( Section 440 ). Care must be taken to tighten clamping bolt
in small end of 442 connecting rod.

To Reassemble Pistons and Rods to Engine, reverse operations given in
( Section 436 ).

It is essential that the pistons are assembled so that the slot in the skirt is
facing the camshaft side of the engine.

CONNECTING ROD BIG END BEARINGS

( Before R 3061 ) — TO REMOVE

SECTION Remove engine undershield, sump, and big end bearing caps ( Section 436 ).
443 Push connecting rod and piston upwards to clear crank journal. Remove bearing

443 liners from connecting rod and cap.

INSPECTION ( Before R 3061 )

SECTION The white metal lining should be whole and free from scores. The liners
444 are not adjustable and the faces should not be filed to take up play in the
bearing, 444 but new liners fitted. Examine crankshaft journals, which
should be free from scores. Check journals for truth. If little or no wear is
evident on the journals, new standard size liners should be used.

In cases of excessive wear on crank journals, necessitating regrinding,
undersize bearing liners will be necessary. Only standard size, and -040’
undersize big end liners are serviced.

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