Timing Pin Dimple is not TDC?

M

Michael_Velling

Member
Hello,

i ordered new timing gears from Mikes. 1 for the crankshaft and 1 for the camshaft.

I alligned them correct (point to point) and completed the engine.

When i put in the timing pin it will rest in the dimple - but this is not TDC on Piston 1.

Is that correct? Is the timing gear from Mikes correct?

Thanks a lot

Michael
 
Michael_Velling said:
i ordered new timing gears from Mikes. 1 for the crankshaft and 1 for the camshaft. I aligned them correct (point to point) and completed the engine. When i put in the timing pin it will rest in the dimple - but this is not TDC on Piston 1. Is that correct? Is the timing gear from Mikes correct?
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When you say "is the timing gear correct," think about what the timing gear is. It's a gear with a certain diameter and number of teeth, and somewhere on there is a dimple. There isn't a "correct tooth" to put the dimple under. All the teeth are the same. The alignment with TDC works because the crank gear is keyed, there's a dot on the crank gear, you match it to the dot on the timing gear. Then you crank it around and, at TDC, the dot should line up with the hole on the timing cover. If that's not happening for you, then most likely there's an error in the assembly somewhere.

- Did it work before you replaced the gears?
- How far off TDC is it?
 
A long time ago the gears coming from argentina had that issue. Have not noted a problem recently but its certainly a possiblity. You are using a model A timing cover i assume
 
Sounds like it is not correct. How are you determining when #1 piston is at TDC? Do you have the head off? Even though you have assembled the gears correctly, with the doubt raised by the dimple mis-placement, I would check the cam timing by noting that the intake and exhaust valves are just off their seats when a piston is at TDC between exhaust and intake strokes.
 
I too am thinking that you may have a Model B front cover. There are pics on Vince Falters web site showing the difference.
 
Hello,

we made the complete engine:

new rods
new pistons
and so on

Then we ordered also new timing gears and assembled the engine

The timing gears are correct assembled:

crank gear with key and cam gear in the correct way on the dowel pins. Then alligned the marks of both gears.

so that is all like les andrews book and how it was.

Now everything is in the car and i want to check the timing for the first start.

Put out the timing pin and put it reverse in to find the dimple - found.
But then the first piston is not on tdc. It is before TDC.

The question is that correct? Is the dimple the mark for the TDC on Piston 1?

Otherwise i will check for tdc without timing pin and adjust the timing so? Like my model T?

Thanks
 
Your assembly is correct. Please verify that the timing cover is model a and not some other model. You can time it by guessing but you risk damage on a new engine if its incorrect
 
Okay, as i understand there are diference timing covers. How can i see which is mine?

I looked in the spark plug hole and see the piston, now i put in a tool from my model t for checking tdc. the engine is on tdc and now it must be possible to check the timing - or not?


Why do people change the timng coverß

Here a picture of my timing cover
 

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Hard to tell from the angle of your photo but i think you have a model B cover. It will have an oval boss
Where the timing pin is. Model A has a round boss. The B cover will advance your timing 14* BTC
 
hello
take the number one plug out crake the motor over with your thumb
on the hole till you feel pressure then set piston on top dead center
then the timing marks should line up
Dennis
 
With the pin in, and a Model A cover, #1 piston is at TDC, and quite accurately. When the 2 dots on the gears are lined up, it is nowhere near TDC, this may be where the confusion lies??? A model B cover is different, and the pin does not indicate TDC.
 
Nobody asked, or I diid not read if your engine is an A or B. The B engine should have a B cover and the piston WILL be before TDC.
 
Just determine TDC and take a drill bit and make your own dimple. Just remember that it is the first or second one that you feel when turning the engine to time. No Big deal, shouldn't have to time it very often.
 
I believe the oval boss was used to produce both A and B timing cover configurations post 1932. 1 casting that can be used to make 2 part configurations is more economical for the foundry and the machine shop. When the timing hole is drilled at the lower end of the oval, its in the A configuration location. If its drilled at the upper end, its a B configuration. My Diamond motor timing cover is drilled for A configuration, and I just confirmed TDC when the pin is in the dimple.
Kevin
 

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Michael, I agree with Jim B and others who think this is a model B cover. The next question is, do you have a model B distributor? (I don't know if you can put the model B into the model A, but I think you can.) If your distributor has the model B advance built into it, you must set your timing to the model B location through the timing cover. If you have the manual advance with the control rod original to the model A, you either need to change your timing cover or find a work around. I would not rush to drill a new divot in the cam gear since the chips will drop into the oil pan. I would suggest making a timing mark and pointer that uses the front pulley as the reference. NuREx sells a kit for this. You would need to go through the aggravation once then have the marker from that point onward.
BTW, good catch on checking your TDC did not line up. A lot of people would not have paid that close of attention.
 
GeneBob said:
NuREx sells a kit for this. You would need to go through the aggravation once then have the marker from that point onward.
BTW, good catch on checking your TDC did not line up.
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The Nu-Rex timing marks work very well and makes it easy to check your timing. I use a light to check my timing and auto advance.

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40-A Twins said:
My Diamond motor timing cover is drilled for A configuration, and I just confirmed TDC when the pin is in the dimple.
Kevin
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Good picture of the timing cover with the elongated boss. Michael should be able to see what we are referring to with your picture.
 
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