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Throttle shaft bushing not serviceable?
by
Ziptar
on 20 Feb, 2013 16:42
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I am finally rebiuilding a TD pump core I bought 3 years ago. I went down to the local Bosch pump shop for a DGK126 kit, pump shaft seal, and a throttle shaft bushing.
They had the kit and the seal but no bushing. The parts guy looked up the bushing using my pump number and said there was one in the whole US it cost $45.00 he added that it was non-serviceable and told me to use the existing bushing.
I guess could try it but, what bugs me is this pump sucked so much air around the throttle shaft the engine didn't start.
I'd always read the bushings were replaceable??
Anyone run across this?
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#1
by
410
on 20 Feb, 2013 17:00
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All the pumps I have serviced I've never had an issue changing the throttle shaft bushing. What engine did the pump come from?
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#2
by
wolf_walker
on 20 Feb, 2013 18:36
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Not me, all I've ever seen are just brass sleeve dealys, press in, press out. There is some anal-retentiveness to be found if you look into sleeve bore alignment and such, but I've known more than a few people that just pressed them in carefully and rolled. Post a pic if you can. I think I bought my little baggy of them on ebay a few years ago.
Failing to be able to replace the bushing, and needing to use the pump you have if that's the case, one might be able to find a redisleeve that fits and takes up the slack. There are good specs for them online.
I've done VW 020 output shafts with em where the seal was worn into the metal over time. Just a thought.
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#3
by
410
on 20 Feb, 2013 18:54
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I'm thinking that if you can buy a throttle bushing for your pump then it must be replaceable.
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#4
by
8v-of-fury
on 20 Feb, 2013 19:29
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I guess could try it but, what bugs me is this pump sucked so much air around the throttle shaft the engine didn't start.
Are you sure? It is on the pressure side of the vane pump, so if it were leaking it would actually be puking out fuel. It still may cause the engine to run like a bag though, as it would not be making the correct pressures.
Prothe keeps these in stock, I have used them many a time with no issue.
$6 too!Buy a couple, they are very easy to deform when installing.
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#5
by
TylerDurden
on 20 Feb, 2013 19:45
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I guess could try it but, what bugs me is this pump sucked so much air around the throttle shaft the engine didn't start.
Are you sure? It is on the pressure side of the vane pump, so if it were leaking it would actually be puking out fuel. It still may cause the engine to run like a bag though, as it would not be making the correct pressures.
There are occasionally leaks, when the engine is stopped, the fuel siphons back to the tank and the IP loses prime... No startee.
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#6
by
8v-of-fury
on 20 Feb, 2013 19:46
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Didn't account for that
lol.
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#7
by
Ziptar
on 21 Feb, 2013 02:54
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Thanks All.. That all makes more sense, non serviceable didn't seem right. The pump was off of an 87 Quantum numbers are 0 460 494 064 and 068 130 107 AN. I'll order up some bushings. I have time to kill anyway, lots of cleaning to do it's nasty inside.
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#8
by
hillfolk'r
on 24 Feb, 2013 19:48
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Heres an idea. Years ago my dad sent the pump out when he got the new engine.
He said" somewhere out west" possibly indiana.
well one of their mods was to cut an extra o ring groove in the throttle shaft to help minimize leakage. Granted it doesnt help a worn bushing. and it may be tricky to machine the shaft in a lathe possibly a mill may be easier id think.
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#9
by
Turbofan
on 28 Feb, 2013 05:57
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I wonder if your part number was the old number. I've done several bushings recently, and on one occasion I talked to the shop owner when I purchased the parts. At some point the old brass bushings were phased out in place of newer steel bushings that last much longer.
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#10
by
92EcoDiesel Jetta
on 28 Feb, 2013 07:25
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I wonder if your part number was the old number. I've done several bushings recently, and on one occasion I talked to the shop owner when I purchased the parts. At some point the old brass bushings were phased out in place of newer steel bushings that last much longer.
What did the steel bushing cost and what is the p/n? I have taken 3 pumps apart (they all have 150k to 200K on them) and none of the bronze throttle bushings are worn. Maybe some heavy sticky axle grease will prolong the bronze bushing's life. A steel bushing will last longer but will wear the throttle shaft faster. I'd rather replace the bushing than have to replace the throttle shaft.
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#11
by
Ziptar
on 02 Mar, 2013 09:16
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Might be the case. I'll have them check next time I go down to order more parts. I ordered a couple of the bronze bushing from prothe. they'll do the job looks like.
I wonder if your part number was the old number. I've done several bushings recently, and on one occasion I talked to the shop owner when I purchased the parts. At some point the old brass bushings were phased out in place of newer steel bushings that last much longer.
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#12
by
Turbofan
on 05 Mar, 2013 17:01
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The bushing P/N I bought was Bosch # 1460324331. I bought it from Metro Diesel Injection in Deep River CT. The is 860-526-5941.
I understand the whole strength of materials concept, but at the same time, Bosch changed most likely updated the material for a reason. The chances of the shaft wearing beyond use will happen well beyond the life of several orings. To each their own, but I'm not afraid of that throttle shaft wearing out for a very long time.
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#13
by
8v-of-fury
on 05 Mar, 2013 17:35
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I have seen pumps with well over 600k kms on them.. That the shaft still fit a new bushing perfectly fine, in fact it was still a tight fit.
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#14
by
92EcoDiesel Jetta
on 05 Mar, 2013 17:57
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I have seen pumps with well over 600k kms on them.. That the shaft still fit a new bushing perfectly fine, in fact it was still a tight fit.
Makes sense. Hardened steel shaft against a bronze bushing, shaft wins.