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Old 03-18-2021, 12:06 AM   #1
blakemcelroy2000
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Hey all. So I recently got my Volvo 122 (B20F, Twin SU HS6s) running and driving. I didn't like the way it was running, and noticed a lot of play in the throttle shafts on the carbs. I sent the carbs to get new bushings installed by a local guy, and was told today that the bodies were too worn to ream and install new bushings. Starting to feel like this car is cursed :( I also put in all the work to polish the dashpots and other parts. Does anyone know a good source for SU carbs? They don't have to be in good shape or complete, as I just need the bodies and have a full rebuild kit already on hand. Any local sources? Im located in Portland OR. Thanks.
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Old 03-18-2021, 02:15 AM   #2
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https://www.ebay.ca/itm/SU-HS6-Carbu...8AAOSw1YNgQoBG
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Old 03-18-2021, 08:55 AM   #3
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Joe Curto is the guy to try. Usually the over size throttle shafts will repair the worn body, if it is more worn than that bushings will need to be installed and line reamed. All of the carbs that I have rebuilt have cleaned up with the O/S shafts.
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Old 03-18-2021, 09:57 AM   #4
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Originally Posted by 283SD View Post
bushings will need to be installed and line reamed
Been there, done that...all carbs wear at shaft.
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Old 03-18-2021, 10:04 AM   #5
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Yes that usually happens to the shafts, Have some hall of shame shafts that I keep just for that reason to show people the wear. I put an O ring when possible on the shafts to carb body to keep out dirt.
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Old 03-18-2021, 10:26 AM   #6
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oilite bronze bushings from McMaster Carr, 3/8 od, use a .375 reamer and dont drop it all the way through, leave 1-3/32 of original body near the ID of the throat so the butterfly seals, and glue the bushings in. Do one side at a time so you can use the old hole as a guide for the new one. Never had a problem installing bushings in the worst of the worst worn out SUs. Sometimes if the holes are really ovaled, Take a syringe of JB weld and lock the throttle plate closed with some wire, fill the hole around the shaft, cure then tap out the shaft before reaming. Then, instead of glue, use JB weld on the new bushing and heat the body to 200F before putting the bushings in. Cure for a few days, then ream with a 5/16 reamer with a full length 5/16-0.001 shank by hand using the shank as your pilot.

The tools can be had at MSC for about 75-95$.
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Old 03-18-2021, 11:39 AM   #7
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Yep, actually shot that guy a message yesterday
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Old 03-18-2021, 11:41 AM   #8
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Originally Posted by 283SD View Post
Joe Curto is the guy to try. Usually the over size throttle shafts will repair the worn body, if it is more worn than that bushings will need to be installed and line reamed. All of the carbs that I have rebuilt have cleaned up with the O/S shafts.
I went to my other guy rather than Joe since I already got new shafts and bushings with my rebuild kit. They're stock size brass shafts with the zinc/stainless (Im not sure, its silvery metal) bushings.
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Old 03-18-2021, 11:44 AM   #9
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Originally Posted by cwdodson88 View Post
oilite bronze bushings from McMaster Carr, 3/8 od, use a .375 reamer and dont drop it all the way through, leave 1-3/32 of original body near the ID of the throat so the butterfly seals, and glue the bushings in. Do one side at a time so you can use the old hole as a guide for the new one. Never had a problem installing bushings in the worst of the worst worn out SUs. Sometimes if the holes are really ovaled, Take a syringe of JB weld and lock the throttle plate closed with some wire, fill the hole around the shaft, cure then tap out the shaft before reaming. Then, instead of glue, use JB weld on the new bushing and heat the body to 200F before putting the bushings in. Cure for a few days, then ream with a 5/16 reamer with a full length 5/16-0.001 shank by hand using the shank as your pilot.

The tools can be had at MSC for about 75-95$.
If my carbs are really as bad as my guy says, I might just try this myself. If it doesn't work, then I guess Ill find some used ones in better shape and try and rebuild those.
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Old 03-18-2021, 04:16 PM   #10
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I'm not trying to cast aspersions on your machining skills, but why re-invent the wheel.

We prefer to rebuild HS6 carbs ourselves, but there is 1 step we don't tackle and that is replacing the throttle shafts. We have the tools to replace the bushings, but it takes a lot of time and then you have to deal with drilling the holes precisely at the correct angles in the throttle shafts.

We send ALL our HS6 throttle bodies to Joe Curto to have just the throttle shafts replaced.

In fact a customer came in yesterday and left us his HS6 carbs to rebuild and I will shipping the throttle bodies out to Joe in the next day or 2.
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Old 03-19-2021, 07:41 AM   #11
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...you have to deal with drilling the holes precisely at the correct angles...
Around here, the "new timers" ain't got the skills, and there are few "old timers" to do it right.
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Old 03-19-2021, 08:14 AM   #12
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Originally Posted by planetman View Post
I'm not trying to cast aspersions on your machining skills, but why re-invent the wheel.

We prefer to rebuild HS6 carbs ourselves, but there is 1 step we don't tackle and that is replacing the throttle shafts. We have the tools to replace the bushings, but it takes a lot of time and then you have to deal with drilling the holes precisely at the correct angles in the throttle shafts.

We send ALL our HS6 throttle bodies to Joe Curto to have just the throttle shafts replaced.

In fact a customer came in yesterday and left us his HS6 carbs to rebuild and I will shipping the throttle bodies out to Joe in the next day or 2.
SU shafts don't have the holes for the throttle plate screws?
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Old 03-19-2021, 08:31 AM   #13
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SU shafts don't have the holes for the throttle plate screws?
Check Here: http://sucarb.co.uk

They sell parts
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Old 03-19-2021, 02:32 PM   #14
blakemcelroy2000
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SU shafts don't have the holes for the throttle plate screws?
I think he was referring to drilling the holes for the linkage horns that connect to the throttle linkage. My new shafts came with the threaded holes and the slot for the throttle plate of course, but not the hole for the linkage horn.
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Old 03-19-2021, 03:20 PM   #15
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Depending on the shafts, you will need to drill the holes for the throttle shaft/pins /linkage to throttle arms, I made a jig to do that.
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Old 03-19-2021, 03:47 PM   #16
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I used Joe Curto too for H4, HS6 and HIF-6 carb shaft issues and misc SU parts.
Another guy is Tom Bryant in Maine.

Been a long time (10-15 yrs?) since, but both guys did good work IMO.
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Old 03-19-2021, 05:15 PM   #17
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Originally Posted by 283SD View Post
Depending on the shafts, you will need to drill the holes for the throttle shaft/pins /linkage to throttle arms, I made a jig to do that.
Ah gotcha. Makes sense.
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Old 03-19-2021, 05:33 PM   #18
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Originally Posted by alschnertz View Post
I used Joe Curto too for H4, HS6 and HIF-6 carb shaft issues and misc SU parts.
Another guy is Tom Bryant in Maine.

Been a long time (10-15 yrs?) since, but both guys did good work IMO.
I got a set of throttle bodies done with delrin bushings by Tom. So far no problems. Seems like an improvement over the stock brass bushings.
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Old 03-21-2021, 06:31 PM   #19
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Old 03-23-2021, 11:22 AM   #20
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Theres also Rhys Kent in the Seattle area. Hes always done a good job for me. But I have recently received all the tooling to handle them myself.

For the throttle shaft pin locations, thats something that is a little tricky, but I have been able to get it done without much fuss.
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Old 03-23-2021, 11:37 AM   #21
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Quote:
Originally Posted by planetman View Post
I'm not trying to cast aspersions on your machining skills, but why re-invent the wheel.

We prefer to rebuild HS6 carbs ourselves, but there is 1 step we don't tackle and that is replacing the throttle shafts. We have the tools to replace the bushings, but it takes a lot of time and then you have to deal with drilling the holes precisely at the correct angles in the throttle shafts.

We send ALL our HS6 throttle bodies to Joe Curto to have just the throttle shafts replaced.

In fact a customer came in yesterday and left us his HS6 carbs to rebuild and I will shipping the throttle bodies out to Joe in the next day or 2.
By my count, there are 5-7 good SU guys to send stuff to. Most are in their late 50s and sometimes have longer than desired lead times. So, the way I see it, learn their craft and carry on the greatness of the SU

Really what it came down to was that these guys learned by doing, so why cant I? I grabbed as many sets as I could off ebay for $300 and spent another $100 on tools. Sat down at the drill press and started futzing with them. Threw a few sets on different cars that friends are willing to loan me for a weekend drive with the wife. Toss a set on, tune em, hit the road. Thew a few hundred miles on a couple sets of carbs and they were happy. Now, I've done about 10 sets from H2s to HIFs and feel somewhat comfortable charging for repair instead of just asking that the owner give me the parts and giving out a racer guarantee of 3 feet or 30 seconds.
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Old 03-24-2021, 09:59 AM   #22
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I have been rebuilding SU carbs since 1974. I have worked restoring British cars since then. I have the O/S pilot reamers and have made many jigs and fixtures for rebuilds. See post above about the jig for the throttle shaft pins/linkage for the HS6 carbs. I still do rebuilds for our local and North East SU carbed cars. Yes I'm getting old,[will be 67] also don't know how much longer I'll do this
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Old 03-24-2021, 10:39 AM   #23
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also don't know how much longer I'll do this
If a YouTube vid was made that gave key points, not a walk thru rebuilding a carb, on how tools (jigs, fixtures, etc) were used, that would be a nice gift.

More like a gentle overview on how/why this/that tool is used on a SU carb. And maybe cite some relevant books/manuals
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Old 03-24-2021, 11:17 AM   #24
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Originally Posted by 84B23F View Post
If a YouTube vid was made that gave key points, not a walk thru rebuilding a carb, on how tools (jigs, fixtures, etc) were used, that would be a nice gift.

More like a gentle overview on how/why this/that tool is used on a SU carb. And maybe cite some relevant books/manuals
Joe Cuturo has a couple good ones. For jigs, fixtures, ect, most of these were assembled and pinned by hand, so they're all different. My favorite jig, green loctite, and a roll of lockwire

My basic process for the shaft levers and pins: Put the butterfly in, close it and make certain it wont open. Slide the lever over with a dab of green loctite, and loosen the idle screw til the lever lays flat on the body. Slide a piece of .25mm shim stock between the lever and body, wire it tight. Use a 1/32 drill bit in a dremel, and mark the hole, give it a little depth so the real drilling doesnt walk. Move over to the drill press and align the hole and drill to size.
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Old 03-24-2021, 03:05 PM   #25
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If you're planning on going with Joe, I just sent a pair of my SUs his way - reasonable price, but right now there is a pretty far back up. Joe quoted me about a 14 week wait. If you're not in a rush, I've heard only good things about his work. But if you need a faster turn-around, maybe look elsewhere.
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