Henrietta Overhaul

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This page is an illustrated story about overhauling a New Major. It will gradually be fine-tuned into a cohesive article.

Henrietta has developed a loud squeaking noise and a heavy knock and it is all my fault! Under a bit of pressure, I took her out without changing the engine oil for about a year. Not that she gets that much work but here in lies the cause of the problem.

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Henrietta is a petrol/paraffin (kerosene) fueled tractor. Unless these engines are working very hard and hot guel tends to bleed past the pistons and dilute the oil. So this has to be changed at frequent intervals to avoid problems. I was rushed. I did not do it before the season started and now I must suffer the consequenses. Just hope I have not completely ruined her as parts for these models could be a bit difficult.

This page is an illustrated story about overhauling a New Major. It will gradually be fine-tuned into a cohesive article.

Photos:

Rough text:

b_major_1 brian13 3. Now we can see more clearly

b_major_2 brian14 4. 4.Timing marks and pointer on MK1 engines

b_major_3 brian11 1. Wishbonepin removed

b_major_4 brian12 2. Move front axle carefully away

b_major_5 brian15 5. Timing gears with marks highlighted

b_major_6 brian16 6. Timing marks

b_major_7 brian17 7. Timing marks on aux shaft drive

b_major_8 brian18 8. Note the oil pressure relief valve on the Mk1 engine

b_major_9 brian19 9. This looks like the problem

b_major_10 brian20 10.No 1 piston and Big End sees the light of day after 50 years

b_major_11 brian21 13.Henrietta's clutch sees the light of day after 50 years

b_major_12 brian22 14.Thrust bearing sounds rough

b_major_13 brian23 15.Clutch disc is well oiled. Replacement liners needed

b_major_14 brian24 17.Now we can see the problem

b_major_15 brian28 20.The crankshaft. Note the heavy webs. This crank also has hollow journals. It was replaced with a stronger version early in the Majors life. This one has done 50 years and apart from No 1 has very little wear

b_major_16 brian27 9.2 Head casting code K21T

b_major_17 brian25 18. Number 1 crank journal is a bit scored

b_major_18 brian26 19. Very light flywheel. Not as heavy as the diesel version

This is the vapouriser on the petrol/paraffin e3ngines. Rather a large lump of metal. Can be subject to heat cracking and metal chrystalisation. Virtually impossible to get a new one.