Fieldmaster Bottom End

For gasket sets click here; individual gaskets click here; rocker oil feed pipes click here; pistons click here; for oil, oil pipes and unions click here; for ball bearings click here.

It is a good idea to have the big-end eyes of alloy con-rods checked for ovality and it is imperative that the oil ways are cleaned out. When rebuilding the bottom end of a Fieldmaster or other engine with a plain timing side bearing we strongly recommend that the bushes are fitted to the crankcases and then ‘line bored’. This will ensure that they are in perfect alignment with the drive side roller main bearings, resulting in a perfect bottom end. We consider this money well spent for peace of mind and saves many hours of scraping in bushes, which is frequently required otherwise. The crankshaft end float should be .002”; shims are only available for increasing the end float, which is controlled by the timing side bush and oil seal washer 1180-37

Standard size of the big end crank journal is 1.375”; the timing side journal is 1.250”; con-rod big end eye diameter is 1.5002/1.5007”. Big end nut torque setting is 22 lbs/ft.

Prices of camshafts and followers are for exchange only, THIS MEANS THAT WE WANT YOUR OLD ONE FIRST. If the follower is badly worn there will be an extra charge to cover the cost of building it up, the cost is listed as 1750-94 in the price list and is per cam follower. The Fieldmaster camshafts always bend when they are heat treated and are always reconditioned by building up, which is included in the price. Additionally if the camshaft is worn where it runs in a bush or bearing there will be an extra charge for reclaiming it by industrial hard chrome plating it back to size, price is given by part number RES-14. This guarantees that you get a good cam. The profiles we use are close but not necessarily exact copies of the originals. We can recondition any cams not listed.

The 1948-53 dynamo strap fixing is awkward to use, life is made easier if the front stud is swapped for the later screw, K149-48.

Case Screws Individual screws may be ordered but for convenience the contents of each set are listed. Sets with a ‘Q’ suffix are in stainless steel.