For The Following Porsche Models
Porsche 911 (1965-1969)
Porsche 911 T/E/S/ Carrera RS (1970-1973)
Porsche 911/911S/Carrera (1974-1977)
Porsche 911 Turbo (1976-1977)
Porsche 911/Turbo (1978-1983)
Porsche 911 Carrera/Turbo (1984-1989)
Porsche 964 C2/C4/Turbo (1989-1994)
Porsche 914-6 (1970-1972)(w/8mm adjustment screws)
Q. Can the SNAPGAP parts get loose in my engine?
A. We have extensively road tested this system (running it in a '78SC for more than a year) and have never had any parts get loose. This is because the stainless steel screw that folds the spring steel collar against the valve adjustment screw threads is held in place by back pressure from the spring steel once it is locked down. Further, the collar screw has a pre-applied high temp nylon threadlocker patch that is good up to 500 degrees F to prevent the screw from rotating. Finally, unlike the OEM jam nut, the collar itself is locked to the valve adjustment screw and, of course, the valve adjustment screw with the elephant’s foot on it is not able to be removed from the rocker arm without taking the entire rocker arm out of the engine.
Q. Can SNAPGAP be installed with the engine in the car?
A. The tools are designed to work in the tight confines of most 911 engines. However, for example and as with other methods, depending on your engine, you may need to remove the CAT or, alternatively, use a standard torque wrench to get behind the CAT or past lines and hoses.
Q. How does SNAPGAP account for "cupping" or other misshapen wear features of the valve stem and elephant's foot?
A. Unlike with a flat feeler that cannot account for high and low spots on the valve stem and elephant's foot, SNAPGAP sets the precise gap even if they are worn or misshapen.
Q. How many times can I re-use the SNAPGAP collars and shims?
A. With our complete kits, we provide enough shims and screws for 3 fresh valve adjustments. Tests have shown that collars can be re-used several times. Individual collars and sets of shims can be purchased separately.
Q. Why can't I reuse the shims?
A. You can, but after you break off the shim handle you may find it hard to access the shim and reinsert it.
Q. Will the SNAPGAP collar harm the threads on my valve adjustment screws?
Q. Can the torque wrench be used to loosen as well as tighten?
A. Yes. It won't hurt the wrench.
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SNAPGAP is designed to work with undamaged valve adjustment screws, rocker arms and rocker arm shafts and bushings. If your valve adjustment screw threads are damaged such that you cannot smoothly screw a M8 x 1.0 OEM nut on and off your valve adjustment screw with finger pressure, you must repair or replace your valve adjustment screw before using SNAPGAP. Using a damaged valve adjustment screw, rocker arm, rocker arm shaft or rocker arm bushing with SNAPGAP can result in inaccurate valve lash which can damage your valves and engine.
Product testers have repaired damaged valve adjustment screws with a 1.0 pitch thread file or M8 x 1.0 die. Of course, replacement valve adjustment screws can be purchased from many vendors.