OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions on Other Engines TROJAN MAJOR - Motor Fitted To Ogden Rotamatic

Was there any wear on the shaft surface?

Ive seen seals in further and upside down so the positioning changes and the sealing lip runs on a good section of the shaft.

It shouldnt matter unless the sealing lip is tapered on a directional 45�, as you would lose a large section of sealing surface area.

Here is the crankshaft, very solid
Big end roller bearing, conrod is quite slim
And one for Jack :-)

Ive seen seals in further and upside down so the positioning changes and the sealing lip runs on a good section of the shaft.

It shouldn't matter unless the sealing lip is tapered on a directional 45�, as you would lose a large section of sealing surface area.

No obvious wear, that's the way the seal is facing in the parts diagram as well

Cool....I assumed you didnt have a manual, Since you said you weren't sure why it was upside down....:)

There does appear to be some wear on both ends? Minimal groove or are they just scuff marks?

Hi HT6,
Surfaces are fine just cleaned them up, I don't have a manual it's all guess work. I found the exploded parts view here

http://www.users.globalnet.co.uk/~pattle/nacc/arc0119.htm

It's pretty much all the info there is on these engines, I was sure which way the seal went just not why ?

Ahhhh....Cool:)

Well at least you found this engine diagram, as it confirms your seals positioning.

All back together fired up, ran and then stopped, sheared the flywheel key ! At least it runs, now I have to find a key.

Muffler and exhaust is off the spare motor as the correct one was still soaking in the cleaner.

Found replacement keys here, in Australia. After an afternoon of computer cross referencing and a lot of searching. Found it by the American reference number 203

http://australianmetalworkinghobbyist.com/store/index.php?route=product/product&product_id=386

Ordered a few spare

Hello Paul

Thanks for the updates.
That mag came up real pretty - and still with the oiled felt
cam wiper. They are a handsome engine.

The story of the key is real detective work.
p.s. Did the key fail because there was no flywheel (bladeholder)?

The Trojan war is almost won.
----------------------------------
JACK

Hi Jack,

I think the flywheel wasn't pulled down all the way on the taper, I replaced the spring under the cam with another one that was a bit cleaner. But it was also a fraction longer which when compressed under the cam held everything up just that bit more. Blade holder shouldn't make a difference on this one as they can run a pulley or a roller or a mower blade. Pretty versatile little engine.

Hi Paul,

Yes, of course. Thank you.
How do you plan to present the cowl? Will it be painted?

Here's a great ad (detail) I recently found.
A couple of OZ manufacturers took the awkward route of protecting
the engine from shock via a spring clutch. They did this because the
blades were rigidly mounted. The clutches were prone to wearing out
(in doing their job) and in the field repairers would remove the clutch,
giving the engine no protection from shock loads.

Cheers
------------------
JACK

Interesting, in the advert it states that there are 3 bearings supporting the crankshaft. I think Victa also stated this in their advertising which of course is correct. A bit misleading to the purchasing public as the Trojan motor has only 2 bearings supporting its crankshaft, I suspect that if there is a third bearing/bush perhaps it is in the clutch assembly. Unless the shaft with the 3 bearings is not the crank but the shaft travelling from the clutch to the blades ?

The crankshaft would only accomodate the clutch assembly, there must be another shaft supporting the spring and blade holder, doomed ! Probably why there are none around now, small fuel tank as well. Just not up to the job, I wonder what other mower you could buy for the same money ?

I was looking at the cowl this morning and there is not enough of the decal and the paint is rubbish so it will get a fresh coat of yellow paint. I will make up a new bracket to take a Victa fuel tank.

Hi Paul

Yes, the 'outrigger bearing' may be above the clutch assembly, but external
to the lower crankcase. I never noticed that before ...

I will link an OGDEN booklet to the record tomorrow. Here is an extract:-



Here is the link to the full booklet HERE.

Cheers
----------------------
JACK

Postie came today, raced out to the mailbox ....... bloody junk mail !! maybe tomorrow :-(

Picture or Video is worth a thousand words

[video][/video]

Awesome Paul!

And a true 1.6 h.p. I bet...
Thanks for the video.
-----------------------------
JACK

Where's the link?

Video above but here is a link
Hope this works for you

sounds nice , lot of links didnt work last week or so too .
thanks Jack
hope he didnt kill it dead though !!!