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  #1  
Old 06-11-2012, 10:45 AM
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I donít 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  
Old 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.
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1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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  #3  
Old 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  
Old 06-11-2012, 12:25 PM
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Most people rebuild them.
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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  
Old 06-11-2012, 12:35 PM
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Quote:
Originally Posted by kerry View Post
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.
by 18" of mercury you mean bar or psi ?

are the pumps hard to rebuild ?
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  #6  
Old 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  
Old 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.
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I donít know vacuum ?? help requested.-screen-shot-2012-06-11-12.55.38-pm.jpg  
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  #8  
Old 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.
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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  
Old 06-11-2012, 01:30 PM
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can u chet the check valve ?
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  #10  
Old 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  
Old 06-11-2012, 10:33 PM
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Well, if you're getting psi, then something is seriously wrong
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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  
Old 06-12-2012, 06:21 AM
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Sorry I ment inches of vacuum
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  #13  
Old 06-12-2012, 08:12 AM
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Quite clearly a piston pump.
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  #14  
Old 06-12-2012, 09:21 AM
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Quote:
Originally Posted by Govert View Post
Quite clearly a piston pump.

????
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  #15  
Old 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.
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