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Air cleaner restriction indicators

P

PM BAKER

Member
I installed Westwood F100-14 Filter Vacuum Gauge on my MF30B, it normally uses a Donaldson ServiSignal mini indicator that shows a red flag when limit is reached. I installed the gauge because it tells me exactly what is going on 0-30hg, not just a red flag like the Donaldson.

I installed the gage, and new filters. I restricted the air intake pipe with my hand almost airtight, and the gage did not move from zero. I removed it and ran a wire up the connector into the intake air stream where the gage connects to the fitting, to make sure there are no obstructions, there were none. I reconnected the gage, and tried again restricting the intake, and with the engine revd up,the suction on my hand was strong, but the gage registered nothing. I think it's a defective gage. The manufacturer is sending me another.

My question is, am I right in my procedure for testing? How can the engine run if I restrict the air almost totally? It was just for like 10 seconds, but I didn't notice much change. Shouldn't I see black smoke or something?

Am I doing everything right?
 
sounds like your getting air from somewhere else.. it should have sucked your hand in very painfully and the engine start to change pitch... look for air bypass somewhere in the system. assuming its a diesel??
 
Check the air filter housing and there should be a small rubber piece with a slot in it. It may be pulling air back up through this piece. I'm not sure of the proper name for this but it looks like when the engine is off it could let water out if any got in the filter housing and should pull up tight when the engine is running.

Maybe someone will post and know what that rubber slot is called. All my diesel tractors have them and I know the MF from the 70's had them as well.
 
It's called a vacuator valve. I think it's also been called an unloader valve to empty excess amounts of dust and water. It pulses when the engine is running and also unloads when the engine is stopped. It works in conjunction with the dust cup.
 
I don"t know what they call the rubber piece you are referring to but it closes with the engine running and opens (in theory) when it is shut down to release loose dust and dirt from the air cleaner shell.
 
You should see some response from the engie if you completely block the intake manifold; black smoke, change in speed, etc. if you don"t you have a manifold leak somewhere. A vacuum gauge thathas a range 0-30 inches of Hg is a pretty wide range for an air filter restiction. 1 inch Hg of vacuum is a lot of restriction on a diesel air filter. Are you sure it"s not in inches of H2O? You really want to measure very low vaccums not the vacuum for a fully restricted flter.
 
It sounds like your gauge is not nearly sensitive enough. Could you hook it up in parallel with the Donaldson indicator. My last couple of trucks have had indicators and when you rev up the engine you can see them move just a little. When I was working I ordered and installed gauges for large motor cooling filters, they were very sensitive, but I don"t remember what the scale was, but I think 0-1" of water, they were called magnehelic gauges.
 

Air cleaner restriction gauges measure inches of water and the limit is usually about 30 inches of water on a manometer. A good clean air cleaner may well run several inches though so even if you are getting air , and it sure sounds like you are, from some other source like suggested, you should get an indication if you have the proper and working sending unit.
 
Air filter gauges are inches of water NOT INCHES OF HG. HG is about 12 time heavier than H2O. You have the WRONG GAUGE. One inch of HG is equal to 2.1 psi

Kent
 
It's a filter vacuum gage, and it says HG inches right on the gage, here's the link: http://cgi.ebay.com/WESTWOOD-F100-14-FILTER-VACUUM-GAUGE-REPL-GAR-BER-FRI-/380347732412?pt=LH_DefaultDomain_0&hash=item588e7dd1bc

Normally, the filter must be cleaned when it reaches 20-25 HG in. That's what the Donaldson Filter gauges specs call for, here's the link:
http://www.donaldson.com/en/engine/support/datalibrary/053979.pdf
 
I covered both openings, I stuck a small funnel in the intake, that fit tighly and only allowed air through the like 5/16" funnel hole, and I covered with my hands the hole for the dust unloader valve (which I have to buy).
 
The intake manifold gasket looks tight, I don't see any sign of leaking. I don't see any holes in the filter cannister, or the filter hose to the manifold. I'll have to keep searching. They are sending another vacuum gauge.
 
I'm new to tractors, but in gasoline engines we spray the intake gaskets with carb cleaner, as any leaks will intake the carb cleaner and rev up the engine. Will this cause any problems on a diesel. I've seen starting fluid lock up a diesel, just wondering if the same osccurs with carb cleaner?

I had 6-71 Detroits, but that was 20 years ago, anyhow I'm not unfamiliar with diesels.
 
You need to go back and take a second look at the Donaldson specs. I think you will find that it states that the filter replacement is based on inches of H2O not inches of Hg.
 
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