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American Bosch injector phasing

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john r brooks
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Joined: 04 Jun 2019
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PostPosted: Thu Jul 30, 2020 4:14 am    Post subject: Re: American Bosch injector phasing Reply to specific post Reply with quote

In straight forward description the flow of fuel begins as the hub mark is at the pointer it stops flowing about 45 degrees past the pointer.
Which is a long way past. The manual says the pump is assembled incorrectly if it is out by 3/8 inch.
 
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Dieseltech
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Joined: 29 Feb 2012
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Location: Indiana

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PostPosted: Thu Jul 30, 2020 7:30 am    Post subject: Re: American Bosch injector phasing Reply to specific post Reply with quote

Something is really wrong, is the throttle wide open, metering sleeve in UP position where it NEEDS to be to check Port Closing? Remove BOTH fuel inlet ant outlet fittings, use a bright light while looking through that port. When the plunger is lifted with the cam hub the pointer should align with the hub just as plunger top CLOSES the port. Either the metering sleeve is DOWN, or wrong head is in the pump, or head installed wrong. That's why I asked for the head number.
 
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john r brooks
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PostPosted: Sat Aug 01, 2020 1:00 am    Post subject: Re: American Bosch injector phasing Reply to specific post Reply with quote

The head number as l can make out is 3208 the body is PSB 4A serial is l think TB 63928. The body also has been stamped Z90. The tractor ran when l got it and l drove it a short distance it ran well enough. l had an injector mechanic look at why it bled fuel into the sump that problem he sorted but it has never run again. I have time tomorrow to check the plunger and metering sleeve as you outlined.
John
 
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john r brooks
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PostPosted: Sat Aug 01, 2020 5:51 pm    Post subject: Re: American Bosch injector phasing Reply to specific post Reply with quote

I am feeling confused. I ran through the internal timing again and it was perfect. Then observed the plunger rising with the bright light, when the light blacked out the hub pointer was bang on the mark. I then ran the gravity fuel test and fuel still BEGINS to flow precisely when hub and pointer line up.
The control arm is back and the sleeve arm moves back although the travel isn't a lot. On a clock face the sleeve arm travels say from 8 o'clock when it is down and about 4 o'clock when it is up.
John
 
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