Author Topic: When in need....  (Read 505 times)

Offline A7er

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When in need....
« on: August 30, 2021, 06:48:10 PM »
I have a confession to make. I have started to dismantle my Austin Seven engine so that I can start designing the half size model. (Is it half size or half scale?) Today I wanted to remove the flywheel which is held onto the crankshaft by a taper and large nut. The nut was easy to remove and I have a flywheel puller. It consists of a bar of steel an inch wide by ¾” thick by about 2 ½” long. It has a threaded hole in the middle and 2 holes that line up with 2 blind threaded holes in the flywheel. All threads are ½” BSF. My puller was missing the central bolt. I remembered that the last time I used it to remove a flywheel I had to use a lot of heat, brute force and swearing. It took several days to get that particular flywheel off, and the middle bolt was beyond saving. So, I had a puller, but no very important bolt and ½” BSF isn’t available locally. I found a piece of steel rod about the right diameter, and I had a ½” BSF die. What I didn’t have was the correct die holder. I had bigger and smaller, but not the right size. There was only one thing I could do. Sorry, you might want to cover your ears. With the steel rod clamped in the vice I used a pair of water pump pliers to turn the die. I cut about 1 ½” of (wonky) thread and screwed the puller into the 2 flywheel holes and tightened down my home made bolt. It seemed to be working until I realised that one of the flywheel bolts was pulling out of its thread. The flywheel threaded holes are only about ½” deep at the most. I removed the bolts and cleaned out the holes as much as I could. Re-assembled and tightened I started to hit the middle bolt very hard. Several moments later the flywheel sprung off the taper and I could remove it. I still have the crankshaft to remove, then I can measure the crankcase and produce a 3D drawing before 3D printing it.

Offline Tonyr

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Re: When in need....
« Reply #1 on: August 30, 2021, 09:39:02 PM »
Hello,
What model Austin Seven do you have.
I have almost finished building an Austin Seven engine at about 1/3 scale.
I haven’t touched it for a few weeks as other things have been getting in the way.
Here is a photo of the model, I will update my build log as I haven’t posted to it for a while.
Tony

Offline A7er

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Re: When in need....
« Reply #2 on: August 30, 2021, 09:46:18 PM »
Hi Tony, I thought 1/2 scale was small, but 1/3, maybe one day! That's a very nice looking engine and I would like to know more about it. I have three A7s, two 1930 specials and a 1933 saloon. I have them all for sale at the moment, I needed a hobby where I didn't have to lie on a cold garage floor! Luckily I have a spare engine to strip down and measure, plus two full scale drawings.
Lee