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Late 1958 D4 7U

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1 year 11 months ago #243383 by projectanavita
Replied by projectanavita on topic Late 1958 D4 7U

might be lucky and not damaged the other gears have them crack tested to be safe. 


I imagine my options are
1) Rebuild the Mag, assuming I can find parts in tollerance
2) Buy a used mag and hope it is in tolerance when it comes and not damaged itself
3) Install an electric start with means of heating intake manifold and likely a different generator (which will be "fun" given my gen also powers the aux hydro)

By "damaging the other gears" you mean the large one this interfaces with? I haven't turned it over to see if there are any issues with it yet as I didn't know where the teeth of this one ended up and didn't want to damage it further.

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1 year 11 months ago #243384 by neil
Replied by neil on topic Late 1958 D4 7U
Sometimes the reason the mag gear breaks, or the mag shaft breaks, is due to worn pony main bearings, so before you put a replacement magneto on, verify that your crank float is within spec. If it isn't, you will risk breaking the next mag gear/shaft

Cheers,
Neil

Pittsford, NY

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1 year 11 months ago #243405 by trainzkid88
Replied by trainzkid88 on topic Late 1958 D4 7U
yes there is 4 gears in that gear train the mag gear, the cam gear, the idler gear, and the pinion shaft gear, also check the crankshaft.

you have 3 choices rebuild the pony which is easier if your in the states as more 2nd hand parts are available.

convert to direct start
or do what im doing and adapt another engine to do the job of the pony.hindsight it would have been the same cost to rebuild my pony.

remove the pony and find those teeth they are probably in the pinion shaft oil well. use a borescope camera to find them all. there is several bungs to drain that housing.

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1 year 5 months ago #248712 by projectanavita
Replied by projectanavita on topic Late 1958 D4 7U
Drained the flywheel housing from the lower plug, then pulled the plate down there to find the stuff on the shop towel. I don't think we ever pulled this before. This explains why I have to hold the pinion starter knob (since I have in seat starting) the whole time while turning over the main motor ... Not sure what the brass looking thing is ... I suspect a seal for something in the pony? 

Going to pull the pony today since I didn't find any teeth in the housing with a magnet. 
Attachments:

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1 year 5 months ago #248713 by Rome K/G
Replied by Rome K/G on topic Late 1958 D4 7U
The main problem with oil clutches and starting engine systems is owners would grind the pinions all the time and all that metal would get into the clutch pump and wear them out.

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1 year 5 months ago #248737 by projectanavita
Replied by projectanavita on topic Late 1958 D4 7U
Was "fun" today loosing the pony ... the engine isn't in the parts book as the number of nuts / bolts was different. The one in the back wasn't too hard to get to but the bolt was an odd find given it was very hard to reach with fingers alone ... going to be more "fun" putting it back on.

Couldn't get it off though ... going to try a come along tomorrow since I don't have a chain wench and my climbing gear wasn't working out too well.

How much does the motor weigh? It seems kinda light given I can lift one side up easy.

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1 year 5 months ago #248745 by trainzkid88
Replied by trainzkid88 on topic Late 1958 D4 7U
from memory about 60kg.

there is a couple of dowel pins that locate it it could be stuck on them. use a prybar on each side to lever it up evenly

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1 year 5 months ago #248748 by rax200
Replied by rax200 on topic Late 1958 D4 7U
Hi There,
There are sis nuts under the pony motor and 2 bolts at the back of the pony motor that needs to remove then the top water hose connections then tilt forward flywheel side and lift off.

Regards

Daryl

1937 RD4 4G4368
1940 D4 7J3717
1942 D4 7J9915SP
1942 R4 6G2550SP
1944 D4 2T6584SP
1945 D4 2T8978SP
1946 D4 5T6271
1956 D4 7U37855
1954 DH226 S/N 89 Howard Tug

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1 year 5 months ago #248750 by projectanavita
Replied by projectanavita on topic Late 1958 D4 7U

there is a couple of dowel pins that locate it it could be stuck on them. use a prybar on each side to lever it up evenly

I ended up doing something similar ... used a pivy bar to lift up each side to confirm it was free ... I think it was just how I had the rigging setup as I had a 5:1 configured but the rope I was using I believe might be too thick for the devices I was using to lift it.

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1 year 5 months ago #248786 by neil
Replied by neil on topic Late 1958 D4 7U
If you can get your footing, you can lift it off by hand.

Cheers,
Neil

Pittsford, NY

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