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saito 100 assembly question

Old 11-18-2006, 10:22 AM
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pault
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Default saito 100 assembly question

hello...i just bought a saito 100 that was disassembled.....the previous owner can't remember which direction the raise dot on the connecting rod goes.......toward the front or the back ?........need advice.........thanks....pault
Old 11-18-2006, 10:46 AM
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w8ye
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Default RE: saito 100 assembly question

The dot goes towards the front and the little end of the pushrods go towards the rocker arms
Old 11-18-2006, 11:00 AM
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Default RE: saito 100 assembly question

thank you........pault
Old 11-18-2006, 03:58 PM
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Default RE: saito 100 assembly question

If you pull the intake lifter, it should just pop out, you can use a pushrod to time the cam. There is a hole in the cam that you drop the pushrod into through the lifter hole. Set the crank to top dead center and drop it down.

If all the parts are from the same engine, you can disreguard the following. When you tighten down the cam housing, just start with the screws finger tight and see how the crank turns, tighten a 1/4 turn and try again. If you start to feel any roughness, IE the gears binding, you need to shim the gear housing up. I've used a soda can aluminum for a shim with good results, sand off the painted surface and clean the sharp edges. The crank should turn freely with no evidence of gear interferance.

Don
Old 11-18-2006, 08:40 PM
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Default RE: saito 100 assembly question

Should have read the first post twice, I just noticed it was about the con rod, not the cam. Sorry.

Don
Old 11-18-2006, 11:39 PM
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Default RE: saito 100 assembly question

ORIGINAL: w8ye

The dot goes towards the front and the little end of the pushrods go towards the rocker arms
You sure about this w8ye? If we are talking connecting rod, mine have always faced the rear - visible through the removed back plate.

There's an image here: [link]http://tech.flygsw.org/sick_saito4.htm[/link]
Old 11-19-2006, 12:29 AM
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William Robison
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Default RE: saito 100 assembly question

Dot on the con rod goes to the rear.

Bill.
Old 11-19-2006, 12:47 AM
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Default RE: saito 100 assembly question

I was looking at a 182 that is disassembled beside me and the dot definitely goes towards the front on this engine. The side with the dot has the chamfer in it.

Edit
Zombie, Whoever wrote that piece in your club news letter was better with writing articles than they were assembling Saito's. You can see right in the second picture where he has assembled the connecting rod on the crankshaft backwards.

In these pictures you can see the chamfer in the crank end of the rod and this goes towards the crankshaft. He shows it reversed in the second assembly picture. The difference in the thickness of the wrist pin boss of three different 91 pistons I measured was not more than .004mm which is .0015". It would take digital calipers to measure this difference?

On this rod, in the pictures, the dot definitely goes towards the front
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Old 11-19-2006, 12:52 AM
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Default RE: saito 100 assembly question

Jim:

The twins are a different world.

Bill.
Old 11-19-2006, 12:55 AM
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Default RE: saito 100 assembly question

I just took a 100 apart to see and the dot is not towards the rear. The chamfer faces the counter weight and on these rods of the 182 TD and the FA100 the dot is not on the rear.
Old 11-19-2006, 12:59 AM
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Default RE: saito 100 assembly question

The 182 was disassembled in a bag when I got it.

But what's important is the relief for the crank pin fillet and that is the side that goes towards the front.
Old 11-19-2006, 01:06 AM
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Default RE: saito 100 assembly question

I just took a FA65 apart and the dot is NOT towards the rear and the rod is installed correctly with the chamfer towards the crankshaft.
Old 11-19-2006, 01:06 AM
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Default RE: saito 100 assembly question

Jim:

The chamfer in the big end is the important thing - the chamfer should be against the crank shaft. All I can say is I've never seen the dot on the chamfered side. Doesn't mean it couldn't be.

Bill.
Old 11-19-2006, 01:17 AM
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w8ye
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Default RE: saito 100 assembly question

Bill,

IMHO it is like you say. The important thing is the relief side goes towards the crank.

The dot is not what is important.

Apparently the dot may be in either direction or not even exist on some rods?
Old 11-19-2006, 07:59 PM
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pault
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Default RE: saito 100 assembly question

hello again...just a follow up on my saito 100....i called the guy that took it apart and he said he never removed the piston from the con rod.........the the piston will only fit in the cylinder with the dot and chamfer facing the front....no binding or weird noises...so i fire it up and it runs great.......thanks for the help everybody..........pault









Old 11-21-2006, 11:11 AM
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Default RE: saito 100 assembly question

ORIGINAL: w8ye
Zombie, Whoever wrote that piece in your club news letter ...
Not my club, W8ye. I'm many miles from it.

You're absolutely right that the chamfer/bevel on the rod needs to face the crank - which would be forward. But this discussion did get me to wondering a bit. So, I called Saito Service at Horizon Hobbies. Their advice is to disregard the dot completely and go by the chamfer/bevel on the rod. Seems there were rods marked both ways - which were used and sent out in assembled engines. No mention of how many.

So, it is possible to see the dot facing either way when correctly assembled.

Glad to learn this little piece of knowledge.

Regarding the pictures above - it does look like he may have the chamfer/bevel facing the wrong way. [sm=lol.gif]
Old 11-21-2006, 04:59 PM
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Default RE: saito 100 assembly question

Good job.

Thanks,

Jim

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