Author Topic: Chang-chai and ST head, deal? Or no deal?  (Read 493 times)

dkmc

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Re: Chang-chai and ST head, deal? Or no deal?
« Reply #30 on: November 22, 2021, 05:57:44 PM »
Progress on the sand pit....

I added a piece of stainless perf. metal behind the fine screen in the pickup to prevent it from being sucked in and distorted like I found it.
I hammered the dent out of the oil pan and that made the crack around the drain bung more pronounced. I think now that the dent did contribute to the crack developing.
It's really clear to see after bead blasting, I think there was braze flux plugging the hole "from the factory".
 I thought of checking the pick up position while it was apart and I'm glad I did because the pick up was slammed flat on the very bottom of the pan. I had to do some heating and bending but now it's about 5/8" up off the bottom.

« Last Edit: November 22, 2021, 06:03:25 PM by dkmc »

dkmc

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Re: Chang-chai and ST head, deal? Or no deal?
« Reply #31 on: November 22, 2021, 06:10:31 PM »
I added a generous amount of silver solder around the bung to strengthen that area. A coat of paint, and it's looking much better. It runs well and starts up easily now, I think the lucas treatment and ATF I put in the fuel helped a lot. Took the ST head partly apart and ordered new bearings and brushes as the bearings are growly and the brushes are stuck in their holders. I'll probably have to bash them out.

A short video...
https://www.youtube.com/watch?v=rOgIELxKVUo

 
« Last Edit: November 22, 2021, 06:12:40 PM by dkmc »

veggie

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Re: Chang-chai and ST head, deal? Or no deal?
« Reply #32 on: November 23, 2021, 02:47:47 PM »

Runs very good !
Nice work.

Suggestion: an open air intake pointed upward is a dangerous arrangement for the engine.
I assume it's just temporary but be careful. Stuff a rag in it when not running.
A tiny piece of debris can mess things up  :)

My Changfa 195 leaked oil at the drain plug welds also. I had to remove it and get it brazed the same as you.

veggie
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