Shrinking on new ring gear

Replacing the ring gear on my 5mb diesel flywheel, old one off easy enough
having a mare getting new one on, next try I’m now heating it above the recommended 250C to 260C and cooling flywheel in freezer but not sure if the cold flywheel more of a hindrance as it might cool the ring gear tooo quickly

anyone got experience of doing this successfully

I used a mapp torch, on the ring gear, went well. Didn't freeze the flywheel. Little heat and moving fast brought the ring gear on easily.

As above no need to freeze flywheel, even a plumbers blowlamp will do this job. 250degrees is not much in metal working, just house oven temperature. Now there's an idea.

Be sure to set it up so it's easy to heat. I've a steel topped workbench, and had the ring gear and flywheel on some bricks, easy to heat the ring gear that way.

Well the Neff oven at 260 and out of freezer flywheel didn’t work caught mid act by wifee coming home early tapping it on on the new quartz worktops don’t know why she was shouting there was a cutting board underneath.

yes I’ve seen the heating up with blowtorch video on you tube tractor flywheel and it slips straight on , probably but worried about losing the temper on it , although I know you can get temp sensitive crayons which change colour.
not in a hurry I’ll ponder next steps

NOT in the freezer, cools the ring to quick and do not worry about the temper. Just allow it to cool gradually.

Yes I did wonder about that I’ll give the oven one more try at hottest without the freezer before the big blowtorch comes out

I place the ring gear on some axle stands heated up with the torch for a few minutes pick it up with some pliers drop it on the flywheel slowly spin it until it starts to grip and then walk away
In fact after my cup of tea I am doing one on a Daf LF as I write this

Right did one this shift, beat old one off with big blunt chisel, 10 blows or so, then 10 slow goes around new gear with oxy torch, then someone came and talked to me about parts, so another 4 goes around the gear with the torch, slow walk across shop to flywheel, dropped gear in place, and I had got it to hot as was now approx 2mm oversize, but shrunk down lovely.
So I can only assume an oven will do as good a job.

And pick a time when the wife's away long enough so you do not have to ru sh the job.

Good plan haha, I’ve not got oxy but a small plumbers blowtorch and also a big propane torch which might be the better bet, I can build a little enclosure out of some spare block paving keep the heat in

Don’t think I could be moythered when they sell em already fitted.

steve2286w said:

Good plan haha, I’ve not got oxy but a small plumbers blowtorch and also a big propane torch which might be the better bet, I can build a little enclosure out of some spare block paving keep the heat in

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Propane will be the boy for a quick job.

Bobsticle said:

Don’t think I could be moythered when they sell em already fitted.

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Early diesels, the ring gear had to lathed off as it was one piece with the flywheel.

£330 for a Britpart version I’ll persevere with heat

Got set up with the propane and sorted after 5mins heating and the ring just fell on , lot faster than oven! Happy bunny yeee. The ringear just sat on 3 screws on the slab by itself to get heat underneath, the flywheel moved to set up the pic just in case peeps thought I heated both together
the worn teeth were over about 3-4” and replicated 180deg out , the mid point of the wear coincided with approx 13 deg After TDC which is when the exhaust valve closes on mine. Showing that it stops and starts usually at just 2 areas on the flywheel and these bits wear out first , so thinking that was to blame for my noisy starter rather than starter itself

Did you time the new gear correctly?

Just kidding

what I referred to above

omg have I missed something

steve2286w said:

Dodgy series starter prob

the starter on my diesel been getting worse over last few months it’s noisy and takes several attempts to turn it over , usually just getting the grinding noise as in video below Once it turns it normally starts but sometimes cranks a bit then grinds On one of the pics the pinion gear is up...

www.landyzone.co.uk

what I referred to above

omg have I missed something

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Tend to find starter dies before ring gear, most people (as would I) wing it and just change the starter, most I see have the bendix bush collapsed, so the bendix gear cannot fully engage with ring gear.
Scania one the other day and the whole bendix assy was laying in the starter motor mounting hole.

You have to use a degree of common sense otherwise costs run out of control.