On the Level and a Little Bored.

Posted: March 7, 2015 in Uncategorized
Tags: , , , , , , , , ,

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So much has happened to the engine since the last post. The engine is in great shape. It has been cleaned, fluxed, machined, leveled, bored, honed, balanced and by the time I post this most likely poured, peened, balanced again, painted, and reassembled. Most of the work was done in my absence; however, the J&M boys were kind enough to send progress photos throughout the process. They also welcomed myself and Len Spinelli (President of the North Jersey Regional Model A Club http://njra2831.org/, good guy, and camera man) to come to the shop for a day of fun/work/schooling. Len and I met up at the NY/NJ border at 6:30AM and hit the road to get to Southborough Massachusetts for an early AM start (targeted arrival by 10AM.  We arrived just before 10AM.

We started by leveling the head and the block. They are both placed on a level base on a milling/boring machine. The machine head then takes swipes If a swipe “shaves” off something from one part but not another part, then the head or block isn’t level. This is an iterative process. The machine takes swipes until the head is level, then the bit is exchanged for a finishing bit that shines the surface down a wee bit more.
J&M Machine Company Cylinder Head Resurface

Once the block is level, the machine is set to bore the cylinders. There is a complicated process to locate the “center” of each cylinder, as you don’t want to measure on one specific spot, as that spot may be warped or worn down. The cylinders are then subject to the same process as the head, but at specific bore sizes (which match piston sizes). All cylinders must be bore to the same size and must not have warps, rust, or groves that would impair the engine.

J&M Machine Company Engine Block Decking and Boring

Don’t forget to shape the valve seats

J&M Machine Company Cutting Valve Seats

Once all cylinders are bore and the valve seats are shaped, the cylinders are honed and finished with precision. J&M maintain that this is where many shops skip a step.

J&M Machine Company Cylinder Honing

J&M Machine Company Cylinder Hone Finish

Let’s not forget straightening the crankshaft

Here are some photos of my crankshaft that they addressed prior to the visit.  I know a bunch of cranks I would like straighted out….

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(this crank in the video isn’t mine).

J&M Machine Company Crankshaft Straightening

…and then grinding it.

J&M Machine Company Crankshaft Grinding

They sent me home with the bellhousing.  They installed the pedal shaft on the bell housing and replaced/installed lower bushings plus installed new bushings in pedals.

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The block is now finished and honed.  Please note the crosshatching on the hone.

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Here are some images of the pistons once they were made ready for the rebuild.  Apparently the heaviest was 2.2 grams off from the lightest.  They are now all within .2 grams of weight.

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You remember that dirty flywheel…. Here is the a before and after of it.

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….. and in case you didn’t see it already posted on Fordbarn.com, here is a tour the Mike gave of the J&M Shop.

I’ve also decided, since spring is around the corner, that I would have J&M’s contacts rebuild the starter and the carburetor. I really wanted to do these things myself, but there are only so many hours in a day and I want to get the car back on the road this Spring.  If timing allows this Month (March), I will be taking apart and restoring the transmission with John Karal (the “North Jersey Model A Guru”).

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Comments
  1. George Barr says:

    Thank You for the Great Tour!! Ya’ll have a beautiful shop looks like you do it all!

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