BEFORE BUYING THIS ITEM NOTICE THAT THIS KIT WILL ONLY FIT OBSOLETE SNAP ON IM5, IM5AP, IM5AQ, IM5BL AND IM5BP MODELS. READ BELOW TO DECIDE FIRST IF THIS UNDERTAKING IS IN YOUR WHEELHOUSE. Take your tool apart first and determine if you need a donor tool for parts I do not provide in this tune up kit. Returns are not in play for this eBay item when you decide your tool cannot be fixed and you want me to provide a refund. Creating a kit like this one takes tremendous time investment and considerable financial costs which I cannot recover. I do it because I have received several requests for Snap On IM5 tune up kits. I have received no help from Snap On nor anybody in the air tool business to get this listing posted to eBay. To the extent that my success here depends your success I will make myself available for phone time help should you need it.
This ebay Buy-It-Now offering provides the above shown parts to tune up your 30 to 60 year old obsolete Snap on IM5 1/2" drive impact wrench and restore it to OEM quality performance. You cannot buy this kit anywhere but from my eBay store. There are 5 versions of the Snap On IM5 as-in: IM5, IM5AP. IM5AQ, IM5BL and the IM5BP model. This kit services the 60 year old print shown above as the ONLY Snap On print I have available for reference. I also stock IM31, IM51 and IM510 obsolete parts and make expert repairs on those tools. Email me if you need further help beyond the scope of this tune up kit. Below I provide useful repair tips for each segment of this old tool. In several cases there are no current replacement parts remedies for some parts of this tool. Snap On engineers limited that in the design of the IM5 tool. I used 3 different IM5 tools to cobble this kit and information below together for a cogent primer on this tool. There are likely to be some issues which will surface due to the general lack of information around these air tools.Service Note Kit Addition 9/30/23. I have now added the front anvil oil seal which is green as shown in the above photos. The anvil oil seals for the Snap On IM5 models can either be an o'ring or a single lip rubber seal. Both items are now provided in these unique kits.
Disassembly of the IM5 tool all models. There are 2 long black rubber bumpers (with 2-1/2" long Allen head screws X 10-24 NC and 1/8" diameter X 2" long dowel pins) on the sides which hold the tool together plus a third 1" long (10-24 NC) Allen head screw located just above the throttle button assembly. Use the appropriate sized Allen wrench on the front end of the Allen head screw to back each of them out completely. Then hold the bumper in place being careful not to bend or break the brittle rubber. Use a 3/16" pin punch. Insert the punch straight through the Allen head screw hole in the front end of the black bumper. There is a 1/8" diameter by 2" long locating dowel pin (on each bumper) that needs to be contacted and driven toward the rear of the tool with a 6 ounce hammer. The pin is not pressed in but the snug clearance requires tapping it out with a hammer and maybe pliers too. Remember that the ears of the aluminum tool housing are weak and can be broken off or easily damaged in any of this work. Avoid bending the bumpers as they are completely obsolete and unavailable without robbing another IM5 donor tool. When the dowel is pulled out the back roll the bumper off the tool. Grab the 3/4" long tubular spacer which is inside the bumper and fits between the ears on the tool housing. Service Note...remember to clean the Allen head screws and tool housing threads for reassembly. Only use a SMALL drop of blue Loctite on the end of the Allen screw threads on reassembly. Please view the photo of the black bumpers above. It shows some photo detail of how to remove the dowel and screw as well as the dowel removal sequence.
There is a threaded insert located in the tool housing for the 3rd case mounting screw. It is located over the trigger button. This threaded insert is removable with a flat bladed screwdriver. It should be cleaned and have the female 10-24 NC female screw threads chased with a tap. The threaded insert should installed about one thread BELOW the tool housing face on reinstallation with a small drop of blue Loctite used to secure it to the IM5 tool housing. The IM5-465 housing paper gasket is 1/64th thick and holds no air pressure. Do treat it with care to avoid tearing it during installation. The tool holds about 1 ounce of 30 weight non-detergent oil. Apply liberal amounts of grease on the impact mechanism for lubrication. The air inlet is where the oil is added often to lube the air motor parts. There is also a small threaded plug on the underside of the hammer case. Use a plastic hypodermic to inject the oil into the assembled tool. The quality of the tool to seal and hold lube oil is dependant on your tool repair skills. You will need to make sure the tool housing and hammer case gasket surfaces are parallel. The anvil must be polished smooth to fit the single o'ring seal. The gasket sealing area is quite thin so bring your "A" game to make the tool seal or plan or greasing the tool once a year by hand.
With the hammer case removed from the tool housing clean and inspect it for cracks and any impact mechanism wear. Use a liberal amount of clean wheel bearing grease for reassembly. Remove and replace the black o'ring in the nose of the hammer case with the black rubber quad ring in the IM5 tune up kit. Use 3m Scotchbrite cloth to smooth the anvil journal for the quad seal contact area and the bushing contact surfaces. Remove the very thin anvil socket ring and reuse it after cleaning and refurbishing the anvil groove with a small steel ignition point file or machinists flat file. Add and install the very thin 1mm thick black o'ring under the metal anvil split ring and onto the anvil groove. Service Notes...There are no replacement anvil rings for the IM5 tool. All I can offer is to add a thin o'ring underneath the metal split ring to adjust for the surface wear to the split metal ring.
Service Notes...Letter R is the large front bearing. Letter S is ME7B21J the largest o'ring for letter T as IM5B201B the front bearing plate. ME11A3J is the front end smaller bearing (1 of 2 in the kit) as letter V and medium sized o'ring as IM5-120A which fits on the brass front end plate hub as IM5-113 letters AA. There is a small and narrow anvil shaft grease seal not identified on the print which fits in the IM5-113 brass front end plate and sits underneath the ME11A3J front bearing. This is the only seal for this tool and comes with every IM5 tune up kit.
Hone part #IM5-118C cylinder as letters AC to remove scratches and grooves. Pitting in the rotor vane blade edged contact surface coupled with deep scratches that cannot be honed and smoothed require donor tool parts. The liner appears to be reversible but does require orientation with an IM5-118 alignment pin (letters BJ) and external polishing for smooth installation. Removal of the air motor can be tricky and requires patience to keep it from binding and digging into the aluminum tool housing bore. Replace the old rotor vanes with new ones from this kit when the rotor has been refurbished. The rear end plate and front end plate can be resurfaced with 200 to 600 grit wet and dry sandpaper. Use water, solvent or spray lubricant to float the brass debris on the sandpaper. Maintain a flat and parallel surface underneath the sandpaper to establish a smooth flat surface. Flush the plates when done surfacing with soapy water and verify that all small air ducts are clean and open with brake cleaner and or compressed air. Make sure the cylinder and rotor end faces are also polished (like with a 3m plastic roloc disc) or Arkansas stone smoothed to remove burrs that cause rotor drag or air motor leaks. Note the above rotor and rear end plate photos. When the rotor has been cleaned and smoothed it is inserted through the rear plate and into the inner bearing race. The new rotor clip in this kit is then installed. On this tool AND any other air tool you repair the minimum clearance between the rotor and the rear end plate should be 0.0015" or 0.038mm as shown. With light oiling the rotor face should not drag or bind on the brass end plate surface.
Replace the rear end plate ME11A3J (other small ball bearing) and rotor snap ring as provided in the kit. Use the new paper gasket for the brass end plate and air motor gasket to seal to the tool housing. The 2 Allen head air motor mounting screws are 2-1/2" long X 8-32NC. They should be run through a die and cleaned so that they can be correctly installed and tightened using a very small drop of blue Loctite to secure them. Over tightening will cause the rotor to lock up and bind against the brass end plates. Make sure that the rotor splines can be turned by hand when final installation of the air motor is done. There are 2 screw holes in the back of the IM5 tool housing. Those holes are the air motor mounting screw holes.
Reverse Valve Service Notes. The above photo with a flat bladed orange screwdriver points to AF as the reverse valve detent screw IM5-162R. The ME1A68J detent pin as AH and detent spring as AG and part #ME1A68J are fit inside the hollow detent screw. They bottom into the housing and contact the reverse valve spool indicated as letters AR and part #IM-160. The detent screw is really too tightly installed in my experience. A light drop of blue Loctite works with just enough tightening. A new spring is kit provided and is not like the OEM spring but it works. Make sure the detent pin has a slightly rounded contact point to the reverse valve spool and grease or oil it for smooth operation. Snap On made an oversized reverse valve spool. I presume it was for cases when the brass tool housing bushing was worn. I have no oversized replacement reverse valves to offer. Make sure that when cleaning and inspecting of the tool is done that reverse valve fitment is given sufficient attention. For this I can recommend partial tool assembly with the reverse valve and detent screw installed and trigger button unit. Attach the air connection and try cycling the tool switching the reverse valve to check for air leaks. This testing procedure can all be done without any new tune up kit parts on hand.
Snap On PH50D4-3 Trigger button service notes. There are no replacement repair parts for a trigger button that leaks air uncontrollably or sticks and binds. In this kit I provide a quad ring trigger body face to tool housing seal. For stem air leakage I provide a small black o'ring that may fix a leaking flange seal. To test fix this problem depress the trigger button stem. On the stem projecting outward slip the o'ring in front of the flange sealing surface where it contacts the metal trigger body on trigger button release. This may do the trick. If not, you would need to buy a spare trigger button unit from another IM5 donor tool. The orange o'ring in this kit is provided for air inlet bushings as part #PH50-7D. If there is an o'ring this would be the seal for that. There is a small debris screen in this bushing. Make sure to clean it, derust it or remove it for repairs as needed. Dirty air cannot be tolerated in any air tool.
The shipping weight is 6 ounces with an eBay USPS.com label for Ground Advantage, the slowest and cheapest way to ship this item. International buyers have this item shipped to Glendale Heights, Illinois for additional processing costs through the eBay Global Shipping Program to process for final delivery.