The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: terry adams on 08.01. 2012 15:58

Title: Oil quantities in Plunger primary chain case and font forks
Post by: terry adams on 08.01. 2012 15:58
Hi Guys

The book seems to contradict it's self

I need to know how much oil to put in a 1955 A10 Plunger primary chain case and the front forks

Thanks

Terry
Title: Re: Oil quantities in Plunger primary chain case and font forks
Post by: shabashow on 08.01. 2012 19:05
From memory its 99cc in the primary and 180ish cc in each leg of the front forks. I've also come across something about oil levels (so many inches below the top or something like that) Sorry about the imprecision, but the correct numbers are in Roy Bacon's book, and I've lent my copy to a nearish neighbour who's rebuilding an early 50s plunger. The plunger capacities are much less than the swinging arm version, and Haynes is remiss in not saying so. I'm sure someone else on the forum will chime up with the exact quantaties shortly,
John
ps how about checking the workshop manual pages on this forum - they might hold the correct info.
Title: Re: Oil quantities in Plunger primary chain case and font forks
Post by: muskrat on 08.01. 2012 19:18
G'day Terry, welcome to the forum.
                                               '52 -'53 forks 212cc, '54 - '57 plunger primary 115cc.
Cheers
Title: Re: Oil quantities in Plunger primary chain case and font forks
Post by: terry adams on 11.01. 2012 21:41
Hi every-body thanks for the replies
you have answerd my questions, many thanks terry.
Title: Re: Oil quantities in Plunger primary chain case and font forks
Post by: LJ. on 11.01. 2012 22:59
Terry, the easiest way is to find the special screw slot that will give you the correct level when screw is taken out. Note the rubber o ring on screw to prevent leakage after you put screw back.  *smile*

Edit: This chaincase is on my 49 star twin... I'm assuming the 55 chaincases are the same...Edit again!: Perhaps not as Muskrat mentions... But you can still check that screw slot. :!
Title: Re: Oil quantities in Plunger primary chain case and font forks
Post by: muskrat on 12.01. 2012 09:24
 My '51 has that screw an assume all plungers do. What type of clutch does a '55 plunger have? Did it loose the cover and change to a swing arm type?
Cheers
Title: Re: Oil quantities in Plunger primary chain case and font forks
Post by: shabashow on 15.01. 2012 12:12
The service literature (at the bottom of the forum) states 100cc for the primary caincase. Where did you get the 115cc, Musky? 15cc shouldn't make too much difference, as long as the chain can dip into the oil and splash it all over all should be well.
Title: Re: Oil quantities in Plunger primary chain case and font forks
Post by: muskrat on 15.01. 2012 12:36
 G'day shabashow,
                         page 212, BSA twin resto by R Bacon. Don't always believe all I read, and known to be wrong now & then.
Another 15cc of my medcine and off to bed.
Cheers