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  • Calvan CV 389-4000 Leak Tester to Determine Valves are Closed
  • Calvan Cylinder Leak Tester

Calvan CV 389-4000 Leak Tester to Determine Valves are Closed

1.00 LBS
$5.95 (Fixed shipping cost)

Product Description


Replacement cylinder leak tester for Calvan 38900, also known as Snap On FRT10-1. Eliminates the need to remove to the valve cover to determine the valves are closed. Commonly used with the Calvan 38900, Time Sert 5553, 5600 and Calvan 39300 3V kits. Can be used with other thread repair kits also. Used on sparkplug holes that have a "well". Helps prevent valve damage caused by reaming/drilling and tapping with the valves open and also helps to isolate the cylinder being worked on. Debris can then be removed with compressed air without being blown past the valves. *Not for use when spark plug holes are near the surface.  

See the video below showing the leak detector popping out when the valves are closed. At 4:05 minutes in the hose pops out. This tool can be used on any engine that has a spark plug well to determine the valves are closed prior to repairing a spark plug hole. We have many TIME-SERT customers that purchase this leak detector when working on other vehicles for this reason. It saves time compared to pulling the valve cover to examine the cam lobes to verify the valves are closed. *Check position of the piston before drilling/reaming to ensure there sufficient clearance. 
Below is a more recent video showing the 389-4000 being used. Unfortunately the valves were bent because the vehicle owner had left a Sav A Thread tap in the hole and started the engine bending the valves! Stopper will pop out in normal conditions when valves are closed.

Related Tools - 

DVD - High quality video instructions on how to use the kit.
Line-up Guide - Needed to properly guide the Core Bit and Tap.

Core Drill Bit - Made specifically to work in the guide/line-up adapter.

Tap - Made to specifications for the 389-100 insert's outside size and threads.

389-100 Insert - Replacement insert for the Calvan 38900. We have bulk pricing available.
Calvan 389-4000 Leak Tester Check for Closed Valves Quickly (02:53)
http://www.denlorstools.com/home/dt1/page_58743_174/calvan_tools_389-4000_cylinder_leak_tester_for_389.html All spark plug thread repair kit manufacturers agree that to confine the shavings as much as possible and to prevent debris from entering the rest of the engine; it's necessary to make sure the valves are closed. One way to verify that the valves are closed for a particular cylinder is to remove the valve cover to check the cam lobe position. The CAL389-4000 can be used to save time on many engines. If there is a well and the spark plug is recessed, the plunger part of the leak detector kit can be pushed into that recess. Then shop air hooked to the other end, the valve is turned on. With air entering the cylinder and turning the engine over with a starter switch or by hand with a socket and a ratchet (on the crank bolt). Once the valves are closed the plunger end of the valve will pop out indicating that the valves are closed. See the following link for the CAL389-4000 product listing http://www.denlorstools.com/home/dt1/page_58743_67/calvan_tools_389_4000_cylinder_leak_tester_for_389.html
  • Calvan 389-400...
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Product Reviews

  1. Works exactly as advertised. 4 Star Review

    Posted by on 15th May 2018

    Very convenient tool, fits in the top of the spark plug/coil tube and pops out under air pressure when the valves are fully seated.

    The only problem I ran into is that the male air fitting is not easily interchangeable. The threads are smaller than standard 1/4" NPT and thus the fitting could not be replaced with any of my regular Milton male couplings. I had to change out the female coupling on my air hose before I could use the Calvan tool, then swap couplings again to use my air ratchet.

  2. Got to have tool. 5 Star Review

    Posted by on 15th Aug 2016

    The only 100% way to determine if you valves are closed! 2002 Ford F150 Super Crew 4.6 liter.

  3. Easiest way to be sure valves are closed 5 Star Review

    Posted by on 26th Sep 2015

    This tool is perfect! Fool proof 15 second way to ensure the valves are closed to do spark plug thread repair. Don't have to remove valve covers.

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