Home 
Home Search search Menu menu Not logged in - Login | Register

 Moderated by: Greg Fletcher
New Topic Reply Printer Friendly
O-rings  Rating:  Rating
AuthorPost
 Posted: 03-15-2005 04:37 pm
  PM Quote Reply
1st Post
Mark Rosenbaum
Member


Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
Status: 
Offline


An update of stuff originally posted on the old board, re-posted here per Greg Fletcher's comments elsewhere on this board.  Information is believed reliable but use it at your own risk.
======================================

NOTE ON MATERIALS:

Fuel- and Oil-resistant: Buna-N (nitrile) is the usual choice. This material WILL NOT WORK FOR LONG with brake fluid.

Brake fluid-resistant: Perfluoro-elastomer or Ethylene Propylene (EP) may be acceptable, depending on what other fluids are likely to be encountered.  For high-temp environments, Viton may be the only suitable material but has a limited lifespan.  None of these materials is inexpensive.  Consult your supplier.

DANGER:  Choose your suppliers carefully!  I have had very poor luck with o-rings from Mainland China, which apparently have a service life best measured in hours rather than months or years.  Sudden O-ring failures can result in lethal disasters.    

 ======================================

DISTRIBUTOR INTERNAL OIL SEAL

Description: Shaft seal, 0.50" shaft, 0.75" bore, 0.125" height.

Material: Fuel- and Oil-resistant.

Used on: Lucas 23D, 25D distributors.

OEM P/Ns: Jensen: None.  Lucas: Unknown.

Source: Chicago Rawhide CR4912 (exact replacement). [Verified fit.]

Source: Transcom TCM 13x19x3VG (nearest metric size).

Source: McMaster-Carr 9505K17 (different seal style). [Verified fit.]

DISTRIBUTOR EXTERNAL O-RING

Description: O-ring, circa 0.937" ID, 0.070" thick.  JH service bulletin 73-18 changed this to an o-ring some 0.079" thick, which apparently is a custom, no-longer-available metric part, most likely 23.5mm ID x 2mm thick.

Material: Fuel- and Oil-resistant.

Used on: Lucas 23D, 25D distributors.

OEM P/Ns: Jensen: 93025 (0.070" thick), 93027 (0.079" thick).  Lucas: 188639 (0.070" thick).

Source: Delta Motorsports 188639.  All the ones I've received from Delta have been the 0.070" part.

Source: Moss 163-750.

Source: AS568A-021, 0.926" ID, 0.070" thick.

OIL PRESSURE RELIEF VALVE O-RING

Description: O-ring, circa 0.637" ID, circa 0.063" thick.

Material: Fuel- and Oil-resistant.

Used on: Spring retainer, Lotus 907 oil pump.

OEM P/Ns: Jensen: 93921 (early engines) or part of 93539 (later engines).  Lotus: A907E6099Z (early engines) or part of B907E0372Z (later engines).

Source: AS568A-016, 0.614" ID, 0.070" thick. [Verified fit]



ZS CARBURETOR FLOAT BOWL PLUG O-RING

Description: O-ring, circa 0.625" ID, circa 0.093" thick.

Material: Fuel- and Oil-resistant.

Used on: Float bowl plug.

OEM P/Ns: Jensen: 93950.  Lotus: X036S6090Z.

Source: Delta Motorsports YEL-PACK.  Also part of ZE15K carb overhaul kit.

Source: Moss 365-470.

Source: AS568A-114, 0.612" ID, 0.103" thick. [Verified fit]

ZS CARBURETOR THROTTLE BYPASS VALVE O-RING

Description: O-ring, circa 0.187" ID, circa 0.0625" thick.

Material: Fuel- and Oil-resistant.

Used on: Throttle bypass valve adjuster shaft.

OEM P/Ns: Jensen: None.  Zenith: Unknown.

Source: AS568A-008, 0.176" ID, 0.070" thick. [Verified fit]

ZS CARBURETOR MIXTURE ADJUSTER O-RING

Description: O-ring, circa 0.250" ID, circa 0.070" thick.

Material: Fuel- and Oil-resistant.

Used on: Mixture needle adjustment screw.

OEM P/Ns: Jensen: Unknown.  Zenith: 019657.

Source: Delta Motorsports 019657.  Also part of ZE15K carb overhaul kit.

Source: Moss 365-420.

Source: AS568A-010, 0.239" ID, 0.070" thick. [Verified fit]

ZS CARBURETOR TEMP COMPENSATOR LARGE WASHER

Description: Circular flat gasket, 0.500" ID, 0.625" OD, 0.052" thick.

Material: Fuel- and Oil-resistant.

Used on: Temp Compensator outer seal.

OEM P/Ns: Jensen: None.  Lotus: X036S6123Z.

Source: Delta Motorsports B17946.  Also part of ZE15K carb overhaul kit.

Source: Moss 365-845.

ZS CARBURETOR TEMP COMPENSATOR SMALL WASHER

Description: Circular flat gasket, 0.250" ID, 0.437" OD, 0.045" thick.

Material: Fuel- and Oil-resistant.

Used on: Temp Compensator inner seal.

OEM P/Ns: Jensen: None.  Lotus: X036S6124Z.

Source: Delta Motorsports B17947.  Also part of ZE15K carb overhaul kit.

Source: Moss 365-840.

ADAPTER PLATE O-RING

Description: O-ring, circa 1.89" ID, circa 0.14" thick.

Material: Fuel- and Oil-resistant.

Used on: Adapter plate to intake manifold seal.

OEM P/Ns: Jensen: 93631.  Lotus: A026S0086A.

Source: Delta Motorsports 93631.

Source: AS568A-225, 1.859" ID, 0.139" thick. [Verified fit]

JH-ONLY PDWA INTERNAL O-RING

Description: Cylindrical o-ring, circa 0.226" ID, 0.365" OD, 0.076" thick.

Material: Brake fluid-resistant.

Used on: Brake PDWA internal shuttles (pistons).  Quantity 2 per PDWA.

OEM P/Ns: Jensen: N/A.  Girling: Unknown.

Source: Unknown.

Comments: AS568A-010, 0.239" ID, 0.070" thick, seems a bit small on ID and OD but might work for a while.  I purchased a bag of these (in EP) a while back but have yet to try them out.  I'm willing to give away pairs of these o-rings to anyone willing to try them out.  If you're seriously interested, send me an email and I'll give you an address to which you can send a SASE.  No charge, but I'd like to know how things work out.  The offer will expire if I should ever run low on the o-rings.

 

Back To Top PM Quote Reply  

 Posted: 03-15-2005 05:38 pm
  PM Quote Reply
2nd Post
Greg Fletcher
Administrator


Joined: 03-11-2005
Location: Lake Nacimiento, California USA
Posts: 421
Status: 
Offline
I know the nitrile is the usual choice, but I prefer the Class 1, military grade Viton o-rings- they have exceptional chemical and oil resistance. Temperature range is -15° to +400°  F. These do not fall apart from contact with oil. What ever you do, void the stuff from China, you can't be sure of the quality.

I'm working on a selection of premium quality, Viton o-rings for the JH to be available in the Club Store soon.

Back To Top PM Quote Reply

 Posted: 09-18-2006 10:29 pm
  PM Quote Reply
3rd Post
Ed
Member
 

Joined: 09-18-2006
Location:  
Posts: 2
Status: 
Offline
Hi Greg,

  While looking over these old posts, I noticed that you were going to offer Jensen Healey O-rings through the Club Store.  Are they available?  I am currently looking for the two small cam tower O-rings and the distributor O-ring.  I am hestitant to go to the local hardware store for these.

Ed

Back To Top PM Quote Reply  

Current time is 01:29 am  
> Jensen Healey & Jensen GT Tech > Miscellaneous > O-rings Top




UltraBB 1.172 Copyright © 2007-2011 Data 1 Systems