Cam gear mount

RayDav November 27th 2020, 8:57 pm

I did a search, did not find anything recent or that dealt with my complete issue.

The engine I am working at the moment I bought as a block, heads and rotating assembly. It was advertised as a 532, so I assume that means 4.5 inch crank. I don't know whose crank it is.

The first thing I noticed was a 0.005 step where the crank gear mounts. From what I read that it typical for after market cranks, true? Does the crank vendor really expect me to force the crank gear on. All the posts I have read said hone the gear to slide fit.

This is not a replacement for another 460 - it is replacing a 425 Toranado in a 63 F100. So I don't have a camshaft thrust plate. The cam is a hydraulic roller from Howard. Stock plate or torrington, and if so from who???

Then there is the other side of the thrust plate. I have decided to try a gear set My first three engines were gear drive - flat heads, and my two diesels are gear drive.

I have gear sets from two vendors. Both cam gears have bronze thrust bushings about a quarter inch thick. On one gear the bushing is a slip fit. On the other it is tight. Slip, tight, torrington???

I have another project I have been working for a couple years. That engine is an Eliminator Ultra at 604. The front is closed, but I did it so long ago I don't remember what is behind the timing cover. It may just be part of my mock up to mount accessories. The cam is a Comp hydraulic roller, roller bearing. Would anything on this engine differ from the engine above.

Both are to be low RPM tow vehicles.

TY

rmcomprandy November 28th 2020, 1:20 pm

RayDav wrote:I did a search, did not find anything recent or that dealt with my complete issue.

The engine I am working at the moment I bought as a block, heads and rotating assembly. It was advertised as a 532, so I assume that means 4.5 inch crank. I don't know whose crank it is.

The first thing I noticed was a 0.005 step where the crank gear mounts. From what I read that it typical for after market cranks, true? Does the crank vendor really expect me to force the crank gear on. All the posts I have read said hone the gear to slide fit.

This is not a replacement for another 460 - it is replacing a 425 Toranado in a 63 F100. So I don't have a camshaft thrust plate. The cam is a hydraulic roller from Howard. Stock plate or torrington, and if so from who???

Then there is the other side of the thrust plate. I have decided to try a gear set My first three engines were gear drive - flat heads, and my two diesels are gear drive.

I have gear sets from two vendors. Both cam gears have bronze thrust bushings about a quarter inch thick. On one gear the bushing is a slip fit. On the other it is tight. Slip, tight, torrington???

I have another project I have been working for a couple years. That engine is an Eliminator Ultra at 604. The front is closed, but I did it so long ago I don't remember what is behind the timing cover. It may just be part of my mock up to mount accessories. The cam is a Comp hydraulic roller, roller bearing. Would anything on this engine differ from the engine above.

Both are to be low RPM tow vehicles.

TY

A normal 532 has a 4.3" stroke and yes the timing gear is NOT supposed to be "slip-fit"; just a couple "tenths" press or "on size".

RayDav December 9th 2020, 3:26 pm

rmcomprandy wrote: and yes the timing gear is NOT supposed to be "slip-fit"; just a couple "tenths" press or "on size".

I have a stock 460 on the floor. The crank gear slides on easily. The step on the 532 crank is about 0.004 larger than the stock - I don't do well measuring "tenths". Stock is slip and aftermarket is press??? 0.004 seems like a lot to press, and remove?

Others have said it is common to hone-to-fit.

Suggestions?

bosshoss December 12th 2020, 6:48 pm

.004 is a ton on a journal that size... way to tight to press on or off.
unfortunately you will need to either hone the sprocket or have the crank ground/polished to fit...

dkp

RayDav December 12th 2020, 8:28 pm

I don't build a engine that often, but I currently have four where I installed the cam drive. I don't recall ever having to press the gears on or off. They have typically been on and off and back on during a build. and were always put on and off without any tools. But others have said they encountered aftermarket cranks that were larger than stock.

I can do a decent job making a hole a bit larger. Making the crank smaller in out of scope. I honed-to-fit both gears. So we shall see.

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