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|-+  Prime movers, diesel and gas engines
| |-+  Changfa/Redstone/Chinese diesels (Moderator: Henry W)
| | |-+  Purchased a Changfa R165 watercooled diesel engine, question about flywheel play
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Author Topic: Purchased a Changfa R165 watercooled diesel engine, question about flywheel play  (Read 8315 times)
Jesse McB
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« Reply #180 on: November 19, 2017, 10:17:58 AM »

After some running of the diesel i check on the valves and torqued the head nuts abit more. I noticed the exhaust valve  had alot of clearance, way to much like 1/8" Shocked The problem is the valve tapet adjusting screws metal is to soft, the push rod  made a indent in it.  And the thing is This is not the orignal tappet screw that came with the engine, i damaged the original when assembling the engine bot long ago, and i have a few spares of these tappet screws but turns out they are hot hardened steel!!?  Angry the intake valve still has its orignal tappet screw and its it perfect shape, and made outta hardend steel. I can tell by using a filer that original tappet screw is very hard steel it dont want to file, but the replacements i have are soft and file away easily. Any way to harden them? Im abit dissapointed lol! Heres a pic of the replacement tappet screw with its push rod indent. And then a pic of the orginal tappet , both have same hours of useage about 3 hours.

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R165 3HP Changfa
R170 4HP Yashida
EL-300-AR 4.5HP Kubota
mobile_bob
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« Reply #181 on: November 19, 2017, 07:30:26 PM »

i am not familiar with the type of screw/adjuster you have pictured

did you make them up after losing or damaging one?

not knowing the carbon content of the thing, you could try the following

use an acetylene torch (oxy/acet) and heat the end that needs to be hardened up to bright red heat
and immediately drop it in a small can of oil, anything will work, try some auto trans fluid.

then check to see if it hardened by using the file test... if it did not harden
reheat again and drop into room temp water... remember the thing has to be fully red hot, almost orange in low light conditions.  then recheck to see if it hardened... if it did... great... go on to the next step

if it hardened, it will likely be too hard.... you will need to temper it back a bit, or it might shatter in use
to do this polish up the end so that it is bright and shiny and then put it on a cookie sheet and place into a preheated oven. set to ~375F or so.... be sure to preheat the oven first

let the thing heat up in there for maybe 15 minutes or so... then take it out and take a look at the polished end... you want to see a dark straw color, almost a brown color would be about right.   if it is a light yellow...

it will still be a bit too hard, simply increase the oven to 400F and let it come up to heat, and bake the little fellow another 15 minutes or so... recheck the color... increase a bit at a time till you get to about dark yellow/brown color...

if there was sufficient carbon in the bolt you used, you might be able to get this to work, actually if there is sufficient carbon content it "will" work.

if you can't get it hard from the first or second quench, it is likely there is insufficient carbon content to harden properly, you are then faced with one of the following options.

1. get a replacement adjuster from the oem, or
2. make a replacement out of high carbon steel, such as a piece of spring steel rod, you can anneal it and machine as you need and reharden it, or...
3. you can case harden the adjuster you have now, that you will need to probably take to a local gunsmith to have done, as he will have the necessary stuff to do it and will have enough experience to do it right.

good luck

bob g

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Jesse McB
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« Reply #182 on: November 20, 2017, 12:11:44 AM »

I will try the harding methods you suggested bob, and i will order in a few hardend fine thread m8 allen bolts that i could drill a spot out for the push rod to set in and cut a groove in the back for the screw driver bit. Yes i think I like the "making it myself" way to solve this problem.  Grin
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R165 3HP Changfa
R170 4HP Yashida
EL-300-AR 4.5HP Kubota
Jesse McB
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« Reply #183 on: November 20, 2017, 07:19:17 PM »

I found just what i need! If you kook at the pic of what the orginal valve adjuster looks like, it looks just like an allen bolt but the head is bored out for the push rod. And the good news is the M8 allen bolt is  exact same size and dimensions as the tappet screw. The diagram of the allen bolt is same dimensions pretty much for then tappet screw except the tappet screw head is in a cone shape.



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R165 3HP Changfa
R170 4HP Yashida
EL-300-AR 4.5HP Kubota
mobile_bob
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« Reply #184 on: November 20, 2017, 08:53:57 PM »

it is also possible to bore out the socket end and then install a hardened insert or cup to fit the pushrod end.

is the pushrod end spherical? or ball end?

if so you could use a piece of carbon steel rod, drill an indention, heat it bright red and drive a ball bearing into the
indention to basically forge the socket for the pushrod.

then machine it down to size, cut it off and insert it into the socket end of the bolt, and braze it in.

reheat and harden, then temper to suit.

or you might be fine leaving it hard as hell, as it will be fully supported within the socket head bolt and brazed in place.

there are flat tappets that have hardened faces that are brazed in place on the end of the tappet head. i see no reason why this wouldn't work, that is if you have the ability and/or a small lathe?

having said that, it would be far cheaper to just contact one of those chinese guys and get a replacement adjuster, but where is the fun in that?

Smiley
bob g
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Jesse McB
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« Reply #185 on: November 20, 2017, 09:45:35 PM »

Now thats another good idea! I will try that aswell i got ball bearings that should be of size and can locate some carbon steel, im gonna try a few methodes, only thing about getting parts from china is you can think its carbon steel but it may not!?
So im going to make the parts my self, be alot better id say!
I dont have a lathe but i wish i had one! it would be so much fun to have, ill be making many parts and stuff with it lol. im going to try to find a small one thats can work with metal, be nice to have around wit what tools i have lol! Most of my tools are for wood, not many are for metal work, i dont even have a welder!  Grin
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"There's nothing like the off grid isolated feeling"

R165 3HP Changfa
R170 4HP Yashida
EL-300-AR 4.5HP Kubota
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