A65 oil pressure switch

[DAVE BRADY]

Hi,

There are parallel and tapered thread varieties but which one for which year of A65?

Dave.

[Ian C]

AFAIK Dave and there may be variances due to manufacturing difficulties, the 1969 model year A65's were fitted with a 5PSI rated switch (BSA no. 19-6504, Lucas 5307/05) which had a 1/8" x 27 NPTF thread. This thread was tapered and classed as 'Dryseal' so evidently no PTFE tape or sealant was required (which I find difficult to fathom)..
From the 1970 pre-OIF model year and then the OIF models BSA fitted a 7PSI rated switch (BSA no. 19-6508 Lucas 5307/1/07 or 5300/07) which had a 1/8" x 27 NPS thread (straight) which had a seal between the switch body and crankcase. HTH

[DAVE BRADY]

Hi Ian,

Thanks.  I think I need the later one.

Dave.

[peasy]

My 71 OIF is straight thread.

[DAVE BRADY]

Hi,

I have late cases so the straight one will be correct.  Thanks.

Dave.