Frequently Asked Questions

Q: I already have a leak down tester. Why do I need the LeakChek Pro?

A:

There are four things that the LeakChek Pro can do that no other leak down tester can do:

 
1
It is very fast (1-2 seconds per cylinder)
2
It has 0.1% resolution so you can not only separate very good from very bad cylinders, but you can also rate marginal cylinders
3
It is very easy to use and everyone gets the same results. Your best and worst operators get the same results and there is no cheating
4
Maybe the most important is that you get a printout to certify your results.
  So now you can see that the LeakChek Pro is very different from any other leak down tester you have seen.
 
Q: Why do I need to know the exact leakage? Isn't my current leak down tester giving me what I need?

A:

With today’s engines and engine controls, marginal valve leaks lead to marginal performance because the car’s computer makes adjustments based on the engine condition. A leak-free head simply runs better than a marginal one.

If you are doing large volumes of heads, you can use the high-precision readings to determine when you tooling need sharpening. Rather than arbitrarily resharpening a fixed intervals, you can watch the leakage measurements rise as the tooling wears. Right after sharpening everything might be 0.3%, 0.5%, 0.4%. As time goes by it might rise to 1.5%, 1.6%, 1.8%. Then it is 3.5%, 3.7%, 3.3%. At some point you can decide it is time to sharpen. Not too soon when you are wasting time and not too late when you are making bad product.
 
Q: Why should I do incoming inspection on cylinder heads?

A:

You should pressure test so that you are not machining bad heads. You should leak down test to sell valve jobs. Let’s say  you get a head from an installer (dealer, general maintenance shop, etc.) and they want you to resurface it. When you do the leak down test you might find that it has a bad valve. You go back to the installer, he goes back to the car owner and tells him he needs a valve job. The owner asks “How do you know” and the installer says” Because the machine shop told me so.” Of course the owner now thinks that you are both lying to him and padding the bill. But now you can present him with certified printed test results. He has no idea what they mean but the installer can say that a cylinder should be less that 5% and his measures 39.7%. He will probably now believe you and you get a valve job. After machining you do a final test and staple the results to the original The owner now sees that his 39.7% cylinder measures 0.4% and he feels confidant that he wasn’t ripped off. Great customer relations for you and the installer.
 
Q: Which unit is better, pressure or vacuum?

A:

It depends on your application. For high-volume shops or remanufacturers where speed is important, the vacuum is best. If you want to test on your valve-seat machine the vacuum is best. If you want to test motors, you have to use pressure to avoid sucking oil into the unit. If you want to do incoming inspection on heads (clean, pressure test, leak down test), pressure is probably the best because you can do the pressure test and then it will take only 1-1/2 minutes to do the leak down test at the same station.
 
Q: What pressure does the pressure model use?

A:

Normally the Pressure Model is normally set to 50 PSI, but you can adjust it from 95 psi down to 20 psi. You will get the same results whether you are at 95 psi, 50 psi or 20 psi. The Vacuum Model operates at –15 psi (at sea level atmospheric pressure) and the results are very close to all setpoints of the Pressure Model. The LeakChek Pro automatically compensates for the pressure so you do not have to keep resetting the pressure as you do with the 2-gauge type leak down tester.

 

 

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