11 Янв 2015 | Author: | Комментарии к записи BSA A65 NEEDLE ROLLER BEARING отключены


My A65 is an early motor with a bearing on the drive side. The bike is a bitser so i decided to do a bit of I thought seeing as the ball locks the drive side a needle roller bearing be sufficient for the timing side. The is a Torrington NKJ 35/30A OD 50mm ID W 30mm.

In the picture the inner is missing. The crankcase was machined all the way and the bearing received 1.5 thou. This bearing is not C3 tolerance so i 1.5 thou off the OD of the inner sleeve the right thing to do].

A with C3 tolerance would be and is recommended.

I don’t like the of the bearing surviving on splash so i have extended the return oil back to the edge of the main and drilled into it a 1mm hole. my is that when i fit an oil filter in the line it will create pressure and give the bearing a of oil.

A 3/16 long series is used and the depth of the hole is

The return gallery passes the oil pump stud hole at a of 13mm to the centre of the oil gallery from the oil pump face.

about the pic quality on this I drilled a 1/4 hole about 1/4 13mm down from the oil face and then drilled the 1mm into the return gallery. The at the bottom without the drill in it is the feed hole to the bronze This hole must be to prevent loss of pressure as it with the oil groove in the N/R bearing.

I machined a small alloy that was an interference fit with the and hammered it home with a and locktite. It only needs to be 4 mm thick as you do not want to block the oil below to the pressure relief

Above is a pic of the oil pump in which i drilled a hole from the side of the pump into the top hole. Below is another of it. The idea is to split the oil in the pump and it out through a special quill to a fabricated block welded to the cover and through a hollow to another welded block and into the crank quill.

The oil stud hole is drilled to 8mm to the larger quill bolt. The of the splitting oil hole is 15mm the top of the stud hole.

The total length of the quill is 66 mm, the threaded portion is12mm and there to the 1st step is 33mm.The section is 10mm long, a 13mm OD and 4flats filed in it. The section is11mm long and 8mm OD. section goes into the oil which is 8mm ID 16mm OD and 7mm W. The hole in the quill bolt is 15 mm down the 1st step. To find the correct you first fit a 3mm thick cork

The quill bolt and 3mm cork can be seen in this pic. note that the forward oil bolt has had the head machined to the same height as the rear so the cover can be fitted. I had to machine 2mm off of the of the idler gear to clear the because i used a later in an early motor which we all is 1mm wider [ I FORGOT DUH!!] I had to machine down the inside of the where the mounds prevent the bush from turning by

The oil pump was also touched up for reason ,see pic. If the crank for that year had fitted i believe i would not had to do those things. However on the side i now know that cranks can be fitted to early 😉


This is a pic of the crank after I machined the inner bearing so it was held firm by the back of the when it was pushed fully The quill is stainless and finally to 8 mm OD.

Note slight bluing on the end of the This was caused by machining a carbide tool DUH i should taken the time to grind it.

Now the cover and finding the oil block First i machined the 2 areas they were to go flat. set up on the oil pump fixing stud

Next fit the inner cover and to a 3/4 drill bit.

Next up the crank shaft bearing and refit the inner cover. time boring to 1

This pic the inner cover fitted the oil pump quill bolt and the quill showing.

This pic oil seal holders and hollow that carries oil from oil quill bolt to crank I machined two steel inserts the of the oil seals and fitted them in the to locate them in the correct while they were After welding they removed and the oil seals fitted circlips to hold the seals in

With hindsight i would use a with a 55mm OD and a 20 mm width. would allow a std gasket to be used under the oil pump.


Tagged as:

Other articles of the category "BSA":

Our partners
Follow us
Contact us
Our contacts

Born in the USSR


About this site

For all questions about advertising, please contact listed on the site.

Motorcycles catalog with specifications, pictures, ratings, reviews and discusssions about Motorcycles.