Needs Pictures: 0
Results 1 to 5 of 5
Thread: Rebushing Carbys
-
20th Oct 2017, 07:07 PM #1Senior Member
- Join Date
- Nov 2007
- Location
- Near Rockhampton
- Posts
- 270
Rebushing Carbys
I'm slowly restoring one of my Datsun 1600's (1971). I purchased a set of twin carbs for it. They are a copy of the British SU but are made by Hitachi in Japan. Not surprisingly the shafts were quite sloppy in the housings so some refurbishment was required.
On disassembly it was obvious that the shafts were badly worn. I'm not sure what material the bushes were made from but I suspect it was harder than the brass shafts.
IMG_1165.jpg
New shafts are not available and I don't have a mill to make new ones so I decided to machine down the originals from 8mm to 7.5mm and fit undersized bushes.
The ER32 collet adaptor I made a while back came in handy. I undersized the shaft but left the thread and throttle lever location original size.
IMG_1170.jpg
I chose to make the new bushes from Delrin. The car won't see a lot of use so I don't think wear should be an issue this time around.
IMG_1174.jpg
Pressed in, still to be trimmed to length and finish reamed.
IMG_1176.jpg
Reassembled.
IMG_1190.jpg
Still a long way to go on this project but i really did enjoy this part.
John
-
20th Oct 2017, 07:09 PM #2Philomath in training
- Join Date
- Oct 2011
- Location
- Norwood-ish, Adelaide
- Age
- 59
- Posts
- 6,541
Will the delrin swell (and jam) if it gets fuel on it?
Michael
-
20th Oct 2017, 07:17 PM #3Senior Member
- Join Date
- Nov 2007
- Location
- Near Rockhampton
- Posts
- 270
It seems to be commonly used in this application. There may be different grades for different uses.
I guess I'll find out soon enough.
John
-
20th Oct 2017, 09:27 PM #4Most Valued Member
- Join Date
- Apr 2012
- Location
- Healesville
- Posts
- 2,129
[QUOTE=GuzziJohn;1928113 I guess I'll find out soon enough.
John[/QUOTE]
A sticking throttle is an exciting experience for sure but you should be ok with delrin according to Dupont, see the table on pg 23.
http://www2.dupont.com/Plastics/en_U...ign/DELDGe.pdf
I have seen quite a few carbs with what l thought were plastic throttle shaft bushes, maybe they were/are delrin?
cheers, shed
-
20th Oct 2017, 10:55 PM #5Most Valued Member
- Join Date
- May 2011
- Location
- Murray Bridge S Aust.
- Age
- 71
- Posts
- 5,943
As shed said, you should be alright depending on the grade of Delrin???
Thanks shed for the link to the Delrin grades.
KrynTo grow old is mandatory, growing up is optional.