Ford Blitz Restoration/Rebuild

Lynn Eades · #1 23-06-14, 13:16

Just as important as any other aspect of the task is the cross hatch pattern. A 60 degree cross hatch is required. This is achieved by the combination of the speed of the drill (hone driver) and your up and down movement of the hone.
Did your new block come with pistons (I forget what you did) or are you sizing the bores to suit the pistons? I would recommend you have it done proffessionally. The piston to bore clearance is very important to a long (engine) life, as is cleanliness. A thorough wash out with hot soapy water after the hone, so that white rags show no marks,then dried and liberally oiled straight away. Along with absolute cleanliness, there is a lot to get right. Much money invested so far. Consider carefully.
If you have to size the bores, the "sheep dag" hone is not the hone to use. It is however good to finish the surface of the bore

Tony Wheeler · #2 23-06-14, 16:40

I'm not quite following here. Why does the block need honing? It's a brand new block, it should already be hone finished to 3.1875 inch. That's what the pistons are designed for, they should fit straight in. Clearance should only be about 1 thou, they'll be sloppy if the bores are honed out further.

If the bores need resizing for some reason, then it should definitely be done professionally as Lynn says. However I don't see why it would be necessary.

Private_collector · #3 23-06-14, 22:10

Block does not need resizing. I am simply doing a final finish to apply the cross hatching better than it is right now. I dont consider it sufficient at present. With the grade of the hone and time spent in each cylinder, nothing will be made 'sloppy'. This is confirmed by the manufacturers information, and advice from 2x mechanics who have inspected the block is that the final hatching has not been done on the cylinders. I believe this was left for the person doing the assembly, rather that at time of manufacture or machining.

The link I posted yesterday will show the specific info on the hone grade I have purchased. Also, a number of youtube videos on its use confirm my use is appropriate. I will give no more than 10 seconds total in each cylinder.

Tony Wheeler · #4 24-06-14, 07:58

Very interesting Tony. I wonder if it has anything to do with being a military block, which would be going through Army workshops. Or is this standard practice for all new blocks purchased bare? I've only ever fitted rebored blocks, and they've always been finished to spec. The only time I've used a hone is for ring jobs, to deglaze the bores and remove the lip. Afterwards I check the piston clearance to make sure it's still acceptable.

It's quite good fun I think you'll find, although if you have an old block it would be worth practicing on, to get the 60 degree pattern Lynn mentioned. Look forward to more pics as the job proceeds.

Lynn Eades · #5 24-06-14, 12:12

Yes, Tony.W., I would recommend a practice. (sheep dag hones are great! They make any bore look good)
Pistons in a set, are not always the same size. In a factory assembly situation the standard pistons used to be graded for size (and or weight) so that an engine might end up with a set about the same. Hopefully the pistons in your set, have been graded (I would expect them to be these days) I would though, measure them.
Tony you will no doubt be setting up a financial relationship with an engine reconditioner for at least the sizing of your gudgeon (con rod) bushes, I am sure you can pick up some expert guidance from him/her (you never know) at the same time.

Private_collector · #6 26-06-14, 11:04

Why on earth would I need someone to mess with the con rods & piston pins?

New pistons, new pins, new con rods with bushes insitu.

Following the test shown in factory maintenence manual, everything fits perfectly.

Fully expect to call for help with some task or another, but wouldn't have thought they should need to muck around with parts which fit properly already.

Funny, for a job that anyone is supposed to be able to do, sure sounds like a lot of things the experts are needed for.

Lynn Eades · #7 26-06-14, 12:25

Tony, You obviously have all the bases covered. Good luck with assembling your engine.

Tony Wheeler · #8 27-06-14, 00:18

Quote:

Originally Posted by Private_collector

Funny, for a job that anyone is supposed to be able to do, sure sounds like a lot of things the experts are needed for.

Yes, but you're rapidly becoming an expert yourself Tony!