Engine Removal Tool

[USN Retired]

I am in the process of building an engine removal tool for my 753 using the diagram shown in the repair manual. I have all the parts cut out and ready to weld. Before I do the welding I want to drill and tap the holes for the two 3/8 X 1 1/4 inch bolts. I can see that the bolts are on centerline of the 1 inch thick plate. I believe the .3125" number is the drill bit size to use before tapping the holes for the 3/8" bolts. I am not sure what the .375" number is? Does it have anything to do with the distance the holes should be set in from the edge of the plate ? Any assistance is appreciated.

 

[TriHonu]

3/8" is the bolt size and is equal to 0.375 inches.
5/16" is the tap drill size for 75% thread engagement and is equal to 0.3125 inches. Take it easy and use plenty of cutting oil and a sharp tap. You will want to remove the tap and clear the chips frequently to keep from binding the tap and breaking it.
The plan shows the hole center is located 1/2" down (middle of the 1" thick plate) and 3/8" from the two edges along the 4" length.
Looking at the angle of the chains I would move the two holes closer together with the holes at least 1/2" in from the 4" dimension (the two holes will be 3" or less apart). As long as you can get two chains bolted to the block without the chains interfering with each other you should be fine. I don't like the plan dimensions with a 3/8" hole centered 3/8" away from the edge. That only leaves 3/16" thickness to support the bolt that is being pulled toward that edge.
Also use good thick washers to support the chains. You don't want that much force on a piece of sheetmetal.

 

[USN Retired]

3/8" is the bolt size and is equal to 0.375 inches.
5/16" is the tap drill size for 75% thread engagement and is equal to 0.3125 inches. Take it easy and use plenty of cutting oil and a sharp tap. You will want to remove the tap and clear the chips frequently to keep from binding the tap and breaking it.
The plan shows the hole center is located 1/2" down (middle of the 1" thick plate) and 3/8" from the two edges along the 4" length.
Looking at the angle of the chains I would move the two holes closer together with the holes at least 1/2" in from the 4" dimension (the two holes will be 3" or less apart). As long as you can get two chains bolted to the block without the chains interfering with each other you should be fine. I don't like the plan dimensions with a 3/8" hole centered 3/8" away from the edge. That only leaves 3/16" thickness to support the bolt that is being pulled toward that edge.
Also use good thick washers to support the chains. You don't want that much force on a piece of sheetmetal.

TriHonu, Thanks for the clarification and recommendations.

 

[Bobcatdan]

TriHonu, Thanks for the clarification and recommendations.

The tool is handy, but completely not necessary. I haven't used one years.

 

[KyMadMan]

The tool is handy, but completely not necessary. I haven't used one years.

Bobcatdan, What are you using to connect to the engine lift "loop" on the inside side of the engine? There is a metal breather tube that blocks most of the loop on mine. Thinking a nut, bolt and washers through a chain, but interested in your technique.