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Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Inside an R-Tek engine

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jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539

Inside an R-Tek engine
Original Message   Feb 15, 2012 6:05 pm
Well I got the bolt stud welded, new old flywheel on, air gap set, good spark.  Put everything else back on the engine.
Still don't have the gov. vane so I just used the spring to keep the throttle at the idle position and used the idle screw
to bump up the idle up a little.  Put the engine back in the housing and it start on the third pull.
Was idling and running well, then I heard a knock, couple seconds later heard another one then another one.
So I shut it down.  Was one of those sounds you know isn't good, kind of a deep sounding clank.
It only made the sound maybe 3-4 times in about 20 maybe 30 seconds or run time.
Pull the engine back out and decided to take it apart to check the rod cap.
When I took the flywheel back off found that the new key I put in was sheared.
( could have had something to do with the knock)
Was really clean inside.



Intake port I believe



Exhaust port.  The two ports on the side run down into the crankcase.  Which is up in the photo.



Rod end on crank. You can see the roller bearings
Rod cap was tight.




Roller bearings in the cap.  Most of them stayed in place when I lifted it off.




I decided to put in the old crank I had from another R-Tek.  Same part numbers.
I put a few drops of oil on the crank journal so the bearings would stay in place.
There is enough space for one more bearing, but that's all that came out.
I guess once they all get spaced that's the way it should be.




A few photos of the difference between the two cranks.  Same part numbers.
Top one is the older one out of a CCR2400
The ends of the counter weights are clipped off on the newer crank. (bottom photo)
and the casting itself is a lot rougher.




New crank on the left.  If I remember to I'd like to weight them both.




Just for comparison.  Honda 11Hp crank on top.




Key way slot on the replacement crank.
Things were going well until I cracked a ring.  Hate when that happens.  There is an alignment pin in the
piston ring groove for both rings.  It keeps the end gap space of both of them aligned right above each other.  Which normally you don't do.
Unfortunately I didn't see the pins at first, pushed on the ring when it was on top of the pin not aligned in the end gap and.... snap.





This message was modified Feb 15, 2012 by jrtrebor
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borat


Joined: Nov 10, 2007
Points: 2692

Re: Inside an R-Tek engine
Reply #14   Feb 16, 2012 1:44 pm
"Can you spin up a crank on a lathe to check for imbalance, though? I'd expect the crank, by itself, *should* not be balanced, since isn't it also trying to help reduce the imbalance due to the connecting rod and piston going back and forth?"

That makes sense. 

Turning the crank on the lathe to watch  to see if the threaded end wobbles would be more productive.  But then, so would a dial indicator.

JRT: 

From page 23 of the manual:

"If a new needle bearing set (32 needles) is being installed, the set will come on strip of paper and the needles will be coated with wax on one side. "

Don't drive yourself nuts looking for no. 33. 
This message was modified Feb 16, 2012 by borat
RedOctobyr


Location: Lowell area, MA
Joined: Nov 5, 2011
Points: 282

Re: Inside an R-Tek engine
Reply #15   Feb 16, 2012 1:59 pm
I have to say, it's always cool to get to see the inside of an engine that's been torn apart. I'm somewhat inspired.

I have a 2-stroke weedwhacker that I'm hoping to replace with something better. It stopped running over the summer, seemed like a fuel delivery problem; I replaced the diaphragm in the carb, then it ran fine. Until the next time, and now it's tough to get running, or to keep running. It's just a cheap machine (was free to me), missing the guard, whose main redeeming quality was that it ran. Now it doesn't even have that

Really don't have the desire to spend a bunch of time to try and get it back on its feet, so perhaps I'll open the engine up instead. That would be interesting. I've never gone deeper into an engine than taking the head off (well, except for a tiny nitro-powered R/C engine which blew a conrod, and had surgery to install a new one). I'm always impressed when someone just dives deep into an engine (even better when the rest of us also get to see pics). It's one of those things I've just never had to do, so I've never tried it.
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539

Re: Inside an R-Tek engine
Reply #16   Feb 16, 2012 2:46 pm
borat wrote:
From page 23 of the manual:

"If a new needle bearing set (32 needles) is being installed, the set will come on strip of paper and the needles will be coated with wax on one side. "

Don't drive yourself nuts looking for no. 33. 

Interesting, on page 30 of the "2 Cycle Engines Service and Repair Instructions". 
(I downloaded the PDF from the link you posted)
It says "When reusing needles, coat crank pin with a thin coat of grease. Install needles (33 to a set) Fig. 13
So which is it guys 32 or 33 ? 
A few photos of the difference between the 1999 - CCR2400 R-Tek flywheel and the 2010 - 210R R-Tek flywheel. Same part #
I guess aluminum must be expensive.  Because they sure cut out a lot.

  

  


New cable routing for the tension pulley, much better.  They have also replaced the lower steel cross tube
with a cast aluminum  piece.
This Toro is much easier to work on than the earlier models.
  

Large access hole for the carb. upper right

This message was modified Feb 16, 2012 by jrtrebor
borat


Joined: Nov 10, 2007
Points: 2692

Re: Inside an R-Tek engine
Reply #17   Feb 16, 2012 3:07 pm
I counted 32 on the image and read 32 needles on page 23 of the manual.  Do you think you can put 16 needles on one side of the crank journal and 17 needles on the other?   Have you actually counted your needles?   If you have 32, I'd go with 32.  
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539

Re: Inside an R-Tek engine
Reply #18   Feb 16, 2012 3:23 pm
No I haven't pulled the rod back off the crank yet to count them.  I counted 32 in the image as well.
RedOctobyr


Location: Lowell area, MA
Joined: Nov 5, 2011
Points: 282

Re: Inside an R-Tek engine
Reply #19   Feb 16, 2012 3:34 pm
This is more of a question than a statement, but might you be better off with 1-too-few than 1-too-many? Being 1 short won't significantly increase the loading on the rest. But being over by 1 could conceivably pack them tightly enough that they are forced to rub against their neighbors. And since the adjacent bearing surfaces (one vs its neighbor) are rotating in opposite directions, that would seem to be a bad thing.
borat


Joined: Nov 10, 2007
Points: 2692

Re: Inside an R-Tek engine
Reply #20   Feb 16, 2012 4:28 pm
Too few or too many will lead to serious consequences.  Having too few might allow a needle to skew.  You don't take chances when dealing with something like this.  The exact amount of needles is required. 
I will wager that the number is 32.
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539

Re: Inside an R-Tek engine
Reply #21   Feb 16, 2012 5:01 pm
I this case you could have to few bearings, but you couldn't have to many.  It wouldn't be possible to fit more bearings in to the space that is provided, the rod caps wouldn't seat correctly.  
On the other hand you could have to few, which could and would cause a problem.  Especially on the down stroke.  If there there is any slop or play in the in the rod connections somethings
not right.  It will eventually hammer itself apart.  Having said that though, having bearings I think is much better setup than machined aluminum crank rod ends.  Could be wrong about that.
borat


Joined: Nov 10, 2007
Points: 2692

Re: Inside an R-Tek engine
Reply #22   Feb 16, 2012 6:35 pm
Two cycle engines cannot operate without roller/needle and ball bearings on cranks, connecting rods etc.  Not enough oil in the system to run plain bearings.  
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539

Re: Inside an R-Tek engine
Reply #23   Feb 16, 2012 8:10 pm

32 bearings

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