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Author Topic: Vacuum & pressure tests  (Read 424 times)

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Offline johnny newburgh

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Vacuum & pressure tests
« on: November 26, 2017, 05:34:34 PM »
 While troubleshooting a saw I learned that you can diagnose issues using a vacuum/pressure gauge. You can check carburetor gaskets diaphragm needle purge bulb etc. Fuel line, Gas cap, Intake,Impulse line, crankshaft seals , base gasket, case. Carburetor tested good.Found a vacuum leak on crankshaft seal clutch side. Checking fuel line/ gas cap looked ok.Pulled vacuum through line and when I held my finger over vent hole vacuum held and when released vacuum dropped. Holding pressure indicates fuel line/ tank was not leaking. When I released finger on gas cap vacuum dropped telling me cap was venting. Thought line was clear because of vacuum bleeding off but that was not the case!! When I was trying to run saw It would not stay running unless choked so I figured It was not getting fuel but I had tested with gauge? So I pulled fuel line/ filter and I found the plastic elbow coming out of tank was clogged. When I used vacuum test I put 5-7 HG and I guess that is a lot more then the engine creates when running. So vacuum/pressure test Is great but beware

Offline Texas-Jim

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Re: Vacuum & pressure tests
« Reply #1 on: November 26, 2017, 06:32:14 PM »
Vacuum and pressure testing is probably the best tool we have to find faults.
What we do in life echoes through eternity.

Offline Mountain_d

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Re: Vacuum & pressure tests
« Reply #2 on: December 20, 2017, 08:01:17 AM »
I would like to try this. Johnny and others that do this, can you give us a description of the tool you use for this so I can buy the right stuff? Thanks. Mountain.
1978 TJ 230E 3.9L Cummins 4B, Husky 372XP, Husky 61, Husky 266XP, JRed 625, Husky 265RX clearing saw,  Woodmizer LT40HD 1995, Kubota 4950DT (53hp 4WD), Wallenstein V90 Skidding Winch, John Deere 610 backhoe, 1995 Volvo White GMC WCA42T SA Dump Truck, 2004 Ford F-250SD 4WD, , Central Boiler OW

Online weimedog

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Re: Vacuum & pressure tests
« Reply #3 on: December 20, 2017, 09:48:46 AM »
Couple of Vac Text tips.


Actually, contrary to what I said in the video; the "CST" did throw a hint or two....:)

Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)


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