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While getting prepared to clean and prep the empty cases prior to vapor blasting I looked at the screw by the relief valve. Thinking to fabricate a port for an oil pressure gauge I set the cases in the frame for clearances. To my surprise, there is no way to get the screw out, as it is almost touching the frame. Motor case to frame mount dimensions from the drawing is within 1/16". Is there another place or way to check oil pressure? Thanks, Gary


67 BSA A65L, 67T120R, 71 Hodaka 100B, 72 HD Aermacchi 350SS "cafe racer" 60 HD Duoglide, 77 HD FLH, 79 HD FXEF, 12 HD FLHTC
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Here's a pic of how close the port is. Gary [Linked Image from i.postimg.cc]


67 BSA A65L, 67T120R, 71 Hodaka 100B, 72 HD Aermacchi 350SS "cafe racer" 60 HD Duoglide, 77 HD FLH, 79 HD FXEF, 12 HD FLHTC
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Certainly someone will come along and refer you to the thread about modifying the earlier oil pressure relief valve to allow a takeoff for a gauge. I couldn’t find it but I know it’s here

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Yes, that has been a topic others have mentioned. (BTW, the tiny O-ring under that screw can leak)
David Madigan has made an OPR that has a AN#3 fitting for the oil line to a gage, specifically for the early A65 with no other port. Maybe he’ll come over….


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
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Thanks, linker48x and KC. I hope someone posts a link for this. I feel the need to at least have a temporary set up to monitor psi upon first start up. My 67 T120R has an easy port and after a few times checking under different conditions I haven't seen the need to keep checking after 1K miles. Gary


67 BSA A65L, 67T120R, 71 Hodaka 100B, 72 HD Aermacchi 350SS "cafe racer" 60 HD Duoglide, 77 HD FLH, 79 HD FXEF, 12 HD FLHTC
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If David come on, I think his setup would answer your requirement for “system check”. Not sure if you are trying to keep the bike at least looking stock, as in the Resto-Mod category. That has been my intention lately, looks stock with hidden modern help.


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
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I made these OPRVs with a banjo for monitoring oil pressure but I am not happy with the leakage past the threads. The same problem as the original. I revised the design as a two piece but it is not compatible with the banjo.
[Linked Image from live.staticflickr.com]
[Linked Image from live.staticflickr.com]

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DMadigan, really nice work and a good Idea. I did find a link showing a brass adapter with a relief valve from Mcmaster carr. Good Idea too. I got to looking at the empty case in the frame and decided the easiest for me would be to duplicate the inaccessible BSA port and make another with access. Here's what I came up with.
[Linked Image from i.postimg.cc]


67 BSA A65L, 67T120R, 71 Hodaka 100B, 72 HD Aermacchi 350SS "cafe racer" 60 HD Duoglide, 77 HD FLH, 79 HD FXEF, 12 HD FLHTC
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With the adapter removed I made a threaded plug with a 45deg. seat from a 1/4-20 allen bolt to match the case. Thanks for looking. Gary [Linked Image from i.postimg.cc]

Last edited by do it twice Gary; 09/28/22 11:46 pm.

67 BSA A65L, 67T120R, 71 Hodaka 100B, 72 HD Aermacchi 350SS "cafe racer" 60 HD Duoglide, 77 HD FLH, 79 HD FXEF, 12 HD FLHTC
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Since you are only using the port for testing, another method would be to make a plug to replace the OPRV with a fitting for the oil line. Just have to be careful when running a cold engine not run the pressure too high.

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Originally Posted by do it twice Gary
With the adapter removed I made a threaded plug with a 45deg. seat from a 1/4-20 allen bolt.......
1/16" tapered pipe fittings work well there too. The thread is about the same diameter as a 5/16" bolt, and 1/16-npt to 1/8" compression fitting adapters are available on line.. That's what I use there.

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If I had an engine apart on the bench, I’d make that port available for future use. After testing to prove satisfactory oil pressure, the small plug would be nearly un-noticeable. Wish I’d done so now.


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
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Originally Posted by KC in S.B.
. (BTW, the tiny O-ring under that screw can leak).

What o’ring?


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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Well, maybe not an O-Ring but close............

A65 Oil Pass Low Fwd.JPG IMG_1294.JPG IMG_1295.JPG IMG_1287.JPG

Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
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Thanks for the pictures!

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You’re welcome, but likely they don’t make much sense at 1st. I have others maybe should post. At the time was trying to understand the system, and find a place I could conveniently tap in to sample oil pressure just like this topic. That turned into looking at various plugs, and comparing different castings. Turns out no place is available on the stock early motors without the pressure switch that came later. Drill and adapt was the only answer for me. Didn’t do it.
Now, David Madigan has done some work on that issue with a special OPRV that has a fitting to a pressure gage. That could be mounted as permanent on a Special build, or used as a temporary install for testing on a Restoration bike.


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
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These may answer some view questions. That sump oil pick-up shown laying loose on the exterior view, was supposed to indicate it is attached to that passage way on the inside. You can see where the long tube is pressed into the case looking at the other inside photo. That photo is also showing the OPRV Relief passage way back in to the sump, has the stick in the hole leading to the OPRV. So many photos were lost with the Photobucket debacle years ago!

A65 Oil Pass Top.JPG A65 Oil Pass Low Fwd.JPG A65 Oil Pass Bot.JPG IMG_1293.JPG IMG_1288.JPG

Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
Joined: Jan 2004
Posts: 5,537
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In the later case, the OPRV relief hole shown in the last picture was reangled to intersect the pickup pipe hole and a check valve was added to the pickup tube.

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Hi KC, seems you learn something every day. My oldest crank case is a 67 (I think, if not then 68) they all have taper Allen head screw plugs fitted in those areas. I never thought BSA would have done anything different.... You would have thought that the O'ring might have been the better solution, from your assesmnet that they can leak... Maybe it wasn't and thats why it changed.

Thankyou for the pictures smile

Last edited by Allan G; 10/07/22 2:28 pm.

Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)


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