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#1
06-11-2012, 10:45 AM
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I don’t know vacuum ?? help requested.
I have a 1980 300SD om617.950 I have installed it into a 1985 4runner and I fell the vacuum pump is not producing adequate vacuum. I put my finger over the hose and I can barley fell a pull/draw ? the engine was in a salvage yard for a few years ? and it is the single port pump.
Is this correct ? thanks for the help from the new bee knob in Wisconsin. some pics of the swap       some video aswell.. First run OM617.950 1985 4Runner tdswaps.com kit - YouTube Last edited by yotadiesel; 06-11-2012 at 10:45 AM. Reason: Notification 
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#2
06-11-2012, 12:21 PM
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Get a Mity Vac and get a reading on the level of vacuum and report back. Should be at least 18 inches of mercury depending on your altitude.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#3
06-11-2012, 12:23 PM
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will do that tonight.
are the pumps hard to rebuild ? or get a used on e from a salvage yard ?
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#4
06-11-2012, 12:25 PM
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Most people rebuild them.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#5
06-11-2012, 12:35 PM
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Quote:
are the pumps hard to rebuild ?
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#6
06-11-2012, 12:56 PM
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1 inch of mercury = 0.49109778 pounds per square inch
Ok I get it now. At least 8.039 PSI
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#7
06-11-2012, 12:57 PM
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Inch of mercury - Wikipedia, the free encyclopedia
inHg is it's own measurement. I would think the pump is a diaphragm unit.
__________________
83 SD 84 CD
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#8
06-11-2012, 01:22 PM
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Picture shows a diaphragm pump. They are easy to rebuild. Common failure is a bad check valve which wouldn't require a new diaphragm.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#9
06-11-2012, 01:30 PM
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can u chet the check valve ?
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#10
06-11-2012, 10:04 PM
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I did take the check valve out and the was now air flow in our out I did get it to open but not close again. So I need a new check valve. But with the check valve in and stuck open my vacuum gauge jumped around from 15-20 psi.
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#11
06-11-2012, 10:33 PM
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Well, if you're getting psi, then something is seriously wrong
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#12
06-12-2012, 06:21 AM
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Sorry I ment inches of vacuum
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#14
06-12-2012, 09:21 AM
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Quote:
????
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#15
06-12-2012, 10:01 AM
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It is the piston pump by pics #2 & 5. The rebuild kit is a little more spendy if its not just a faulty check valve.
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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