| Archive for The Unofficial Mamod and Other Steam Forum The Original Unofficial Toy Steam Forum Established 2006 The biggest, most popular global steam forum around! Accept NO imitations! We have a growing community of regular posting members who chat about all aspects of toy and model steam. |
| metalhead100 |
MM2 gets a tune-up !.... bearings/bushings !!!!!!!!!!!!!!Compare this to the first post where the meths burner wanted to jump out of the firebox in the post linked here to the first video.http://modelsteam.myfreeforum.org/about22887.html I made bushings out of brass hose barbs (2 required ..I cut them off in the middle and retained the flange ) I shimmed the trunnion bolt with .005 Teflon wrapped around it to cover the shoulder it rides in... I shimmed the crankpin with the same... And I balanced the flywheel on my propeller balancer........ She runs allot smoother now ....got rid of the gravel crusher sound it had....video shot with same camera phone so compare the volume. http://www.youtube.com/watch?v=JtdF6KKBC5I I enjoy tweeking these engines and smoothing them out.... Jim |
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| redryder |
That came out great.
The difference is huge. Great work Jim !!!! Gil |
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| johnreid |
Another sooper smooth Metalhead engine. | ||
| 27ace27 |
at first I wondered if it was even running! you could run that in the middle of the night right next to the person sleeping and not wake them! AMAZING!  
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| johnreid |
You should hear or should I say not hear his D20 | ||
| metalhead100 |
John the second D-20 (your old one) is a kitten now.....She runs so well.
Jim |
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| Les |
That is so quiet and it doesn't want to dance anymore. 
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| Steve_S |
What a difference that makes! 
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| Sandman |
Jeez. You'd swear that was two different engines.
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| ozsteamdemon |
Great work there Jim .
With the reduction of noise , efficiency and output must be up , too .
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| IndianaRog |
Jim, you ought to think about offering a "rehab shop service"...folks could send you their noisy, rattling engines and you could turn them into precision machines.
The difference is amazing !!! Rog |
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| Stilldrillin |
Well done Jim! 
Makes a big difference. Satisfying too! 
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| metalhead100 |
I would be glad to re-furb anyone's gravel grinder!...
Just send a PM....? jim |
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| Les |
I think the noise and rattle is part of the charm of these engines.
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| Wallace |
That's really neat
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| Dr. Rog |
Great job
Some engines are just too worn not to retore. Toy engines are not designed to be run hundreds of times, just until the child becomes bored. These techniques add enourmously to the life of engines. I am watching very closely. 
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| metalhead100 |
This engine was mint-unfired days before the Tune up....I got it new from Gil.
It was stock when I started
Jim |
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| igy569 |
Jim... I should send you the engine part of the D21. I almost think it is a lost cause!!
I keep eyeballing that D20 engine only on ebay... (just can't afford it!) You have made that MM2 a sweet runner!!
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| metalhead100 |
Go ahead Owen....I will fix it for free my friend.
I would be thrilled to do it.I even offer to pay return shipping! I could bench run it off my 1400 watt boiler ... 
As for the D-20 replacement engine on ebay ,It will be just as bad.... And yes insane price.I asked them if they would take less....and NO... They want more than I paid for either D-20 I have. Jim |
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| igy569 |
Hmmm....
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| Dr. Rog |
One for the purists
I have some pretty worn engines, one old vertical has maybe 20thou of rattle in its crankshaft due to wear. It definately needs metalhead-type bearings.
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