Iron Barrel Leak Down Tester

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Larry S
Posts: 192
Joined: Mon Aug 26, 2013 5:47 am
Location: Lodi Ca.

Iron Barrel Leak Down Tester

Post by Larry S »

1/8" Aluminum flat stock
Intake gasket to use for pattern
Auto tubeless tire valve
Auto freeze plug
Low pressure air gauge
Old fouled spark plug
Female plug from air line coupler and plug

Using the gasket for a pattern, cut a piece of aluminum to cover the intake. Drill it to accept the tire valve.

Bust out all the porcelain from the spark plug. (It's not easy to do.) Porcelain is tough stuff. Weld the air line plug into the spark plug base. If you don't have access to a welder, you can use J B Weld. If you use J B Weld you must tighten your adapter with a plug wrench, then put the gauge in the adapter.

Use the freeze plug to plug the exhaust.

Pressurize with bicycle pump.
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matt glascock
Posts: 2520
Joined: Thu Oct 24, 2013 5:20 pm

Re: Iron Barrel Leak Down Tester

Post by matt glascock »

...Another great rendition.
dirty_rat
Posts: 752
Joined: Mon Jul 22, 2013 10:39 am
Location: Spring Hill, FL

Re: Iron Barrel Leak Down Tester

Post by dirty_rat »

My set-up is very similar, but instead of using a bike pump, I use the small hand squeeze bulb from a blood pressure cuff to pump up the pressure. Makes it easy to pump up and watch the readings.
dirty_rat
Posts: 752
Joined: Mon Jul 22, 2013 10:39 am
Location: Spring Hill, FL

Re: Iron Barrel Leak Down Tester

Post by dirty_rat »

Forgot to mention. I also remove the valve stem when doing this. I also attach a vacuum pump and pull a vacuum on the engine to -6 lbs. of pressure to insure the engine isn't also sucking in at a seal.
TheBevman
Posts: 172
Joined: Fri Sep 06, 2013 5:04 am

Re: Iron Barrel Leak Down Tester

Post by TheBevman »

Dirty-rat, I use a blood pressure cuff bulb too. Here I was thinking I was smart. Proof positive that all the good ideas have been done before :lol:

Larry, brilliant idea in using the spark plug to mount the pressure gauge too.

Bev
'72 Wombat (94)
'68 ACE 100 (Project with the kids)
'65 ACE 90? (Frame)
'66 Triumph Bonneville
'99 Triumph Adventurer
'66 Ace 90/100- Dirt only
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