Mikes Road loco

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Re: Mikes Road loco

Post  Jim the Shovel on Mon 18 Jan 2016, 9:27 am

Hi Lynn

Although I'm building a 4" SCC I'm finding all your pics of both your engine and this one very informative.
Keep up the good work.

Regards

Jim

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Re: Mikes Road loco

Post  He Who Must Not Be Blamed on Mon 18 Jan 2016, 11:18 am

I like this thread. Carry on, Lynn!

Eric

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Re: Mikes Road loco

Post  lynnr on Tue 19 Jan 2016, 6:52 am

Welcome to today's episode. This is a timely episode indeed.

Eccentric reach rods.

LP Eccentric's needed adjustment as too far in to the crank and fouled the water pump eccentric.



Loosened off the grub screws to move the eccentrics over and found no evidence of thread lock. Make sure there is some on these as the grubs could come loose and either allow the eccentric to wander sideways or the screw work its way out to gouge the inner surface of the eccentric strap making a right mess of it.

As commented when I started taking the engine apart. I found the reach rods were all bowed. Well found the reason. 3 out of 4 rods have the flanges incorrectly installed.

Need a lot of heat to break the countersunk screws out of the flange fitting due to the plating.





LP side test fitted


HP side test fitted



Piston rods test fitted



Looks correct but will need to hand wind the crank and observe to make sure.

Oh while I remember.

When fitting the little end bearings and securing pins. Put the pins in from the middle. i.e. with the nuts on the outside. Otherwise you need to take the valve rods off to get the little ends apart.




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Re: Mikes Road loco

Post  Steve Traill on Tue 19 Jan 2016, 10:01 am

My valve rods were less than straight, just put them in the vice & bent them straight. I think the brazing might have bent them, they bent back straight easily though. When fixing the eccentrics I prefer to fit two short grub screws so that the second one locks the first. I've had a bad experience with locktite & grubs screws where you can't get the little b***ers out as the heads are rounded off inside.

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Re: Mikes Road loco

Post  lynnr on Tue 19 Jan 2016, 10:10 am

If I remember correctly they are wire eroded.
But know what you mean on locktite

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Re: Mikes Road loco

Post  Tony King on Tue 19 Jan 2016, 11:21 am

Hey Lynn, don't forget to turn that mud hole bracket on the boiler top through 90deg! If it were a real one doing the job it should do, it'd be making a right mess of the copper cleading ring as well as not sealing!!

Job coming along very nicely, lots of good general info for everyone!!

Regards,
Tony

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Re: Mikes Road loco

Post  lynnr on Tue 19 Jan 2016, 12:35 pm

Thank Tony.

Kept looking at the mud hole but could not put my finger on what was incorrect.

Now you pointed it out. Yes I will correct.

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Re: Mikes Road loco

Post  lynnr on Wed 20 Jan 2016, 5:32 am

Cranking along and gearing up for a differential approach to things.

Water pump reduction gear fitted.



Lots of gear boss filing and fitting.



Main axial installed and differential built up with the corrected collection of shims. Now moves



Crank gear cluster fettled and fitted. Including rounding off the inside of 2nd gear so it fits into 3rd recess and the filet on the crankshaft.



Rescuing the bronze bushes from the gear selectors. Due to plating on the levers the bearing and bush holes were way way too tight.



Got one bush to try and rescue. Somewhat worse than the rest. Hole in middle not round and flats on the outer surface "mashed" May need to request a new replacement.




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Re: Mikes Road loco

Post  lynnr on Wed 20 Jan 2016, 9:21 am

Valve spindle spacers have now arrived so I can get the expansion links all back together tomorrow and the eccentrics checked for alignment. Then I can tighten up all the nuts and lock them in place.


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Re: Mikes Road loco

Post  Road loco on Wed 20 Jan 2016, 9:55 am

Looking very good Lynn, it's starting to come together now so well done, 👍😃

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Re: Mikes Road loco

Post  lynnr on Wed 20 Jan 2016, 11:03 am

As long as you are pleased with progress Mike.


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Re: Mikes Road loco

Post  Road loco on Wed 20 Jan 2016, 11:04 am

Yeh really pleased, think u need a day off thou 😃

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Re: Mikes Road loco

Post  lynnr on Wed 20 Jan 2016, 11:14 am

Nah!

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Re: Mikes Road loco

Post  Road loco on Wed 20 Jan 2016, 11:25 am

That's what I like a keen builder with lots of pictures 👍

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Fast work!

Post  Steve Traill on Wed 20 Jan 2016, 2:33 pm

At this rate the engine will be in steam by the weekend!! Great job, nice pics.

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Re: Mikes Road loco

Post  lynnr on Thu 21 Jan 2016, 4:52 am

Does not look much for 4 hours of graft. But it was all heavy and heavier work.

Right hand drive flange.

Drifting on the drive flange over the adjusted keyways.

Need the help of the hot(ish) spanner.



Now its on the correct way. Might need slight adjustment with the 10lbs sledgehammer later.



The wheel drive flange would not fit the casting at all so taken apart for adjustments.



Drive pins turned down .2mm to allow fitting in the cast drive flange. Faces all cleaned up for refitting.



Now that is what it should look like.




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Re: Mikes Road loco

Post  lynnr on Thu 21 Jan 2016, 7:43 am

Well. Did not expect that!

Once I got the drive flange and retaining washers installed with both wheels mounted. The differential was locked solid. No rotation at all.

So after 2 hours work the differential moves well enough. It will "break in" as still a bit lumpy.

Off it comes






Pinions bushes altered



Going back together


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Re: Mikes Road loco

Post  Road loco on Thu 21 Jan 2016, 12:16 pm

I'm just hoping Lynn that traction world keep to there word and the final kit wil be ready pretty soon otherwise u will be waiting on that? Well done on today's progress 👍

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Lumpy diff

Post  Steve Traill on Thu 21 Jan 2016, 12:41 pm

STW have supply of diff pinions now that fit properly & don't need to be spaced out so the teeth only just touch. Ring Steve for a set by return, there is a small charge for them though just to cover costs. Then you can have a silky smooth diff that doesn't do a hop, skip & a jump when going round corners!

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Re: Mikes Road loco

Post  lynnr on Thu 21 Jan 2016, 12:52 pm

Mike. Do you wan to go with the new diff pinions?


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Re: Mikes Road loco

Post  Road loco on Thu 21 Jan 2016, 1:13 pm

Hi do u no what the cost is?

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Re: Mikes Road loco

Post  lynnr on Thu 21 Jan 2016, 1:38 pm

Best you phone then and ask as it is your choice. Then just let me know.


On my diff. I reduced the bush size on the outside of the pinion. This allowed more radial slop and fairly cured the problem. Been running Crsytal for almost 700 hours and last year 180 road miles. Sometimes getting very stuck in mud with a wheel spinning and the diff was silent.

The diff only rotates very slowly when cornering. So unless you are doing donuts or very asymmetric traction it never moves fast enough to hear.

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Re: Mikes Road loco

Post  Tony King on Thu 21 Jan 2016, 1:40 pm

So good to see an excellent build thread being constantly updated, well done to all who contributing!! Very Happy
So much information of use to everyone building & running DCC engines! cheers

Regards,
Tony

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Re: Mikes Road loco

Post  Steve Traill on Thu 21 Jan 2016, 2:04 pm

61.40 inc. postage & vat

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Re: Mikes Road loco

Post  Kevster on Thu 21 Jan 2016, 10:49 pm

61.40 to replace an originally supplied sub standard part , should be offered to all batch one affected diffs for free I would have thought .

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Re: Mikes Road loco

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