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TDC Tool

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Sorry I didn't explain completely... I'm talking about the freeplay/rock of the piston in the bore as well as the freeplay in the pin/crank/journal ever so slight as it may be. When your measuring in thousanths of an inch, it can make a difference!
 
How close do you have to be? The timing gear teeth aren't set apart at such close angles. Or did I completely miss something?
 
Alec, I 100% agree the original tool mentioned here is a joke. On the Spridget race engines I build we alway move the timing pointers to the top of the motor for ease of timing. I've made special piston stop jigs to use on the block when assembling that use two of the threaded holes for the head studs and have adjustable stops on them so it doesn't matter if I'm working on 10 to 1 dish 1275 or domed piston 16 to 1 948. As for as a threaded adjustable device worrying you, I have jam nuts so its locked down once the correct position is determinded Piston stops has long been a standard of the industry. I also have made my own units for assembled engines from 14mm bolts like the one CV Products sells, 20 years before CV products ever offer them for sell. Cheers Alec.
 
Kenny, all this thread is doing is confusing you I'm sure. Are you starting form sratch with a different pulley or something. I done this way too many times to remember, just did it last week on Darryl x-flow head MGB motor, he bought those alloy pullies from the guy in Canada and I had to reference TDC from scratch, call me if you like and we can go over this, all my contact info is on the website
 
A dial indicator on top of a piston isn't really all that accurate - but it depends what you're timing. It's fine for valve clearances, for example, but not nearly precise enough for ignition timing.
Get a degree wheel on the crankshaft for best.
 
Hello Roger,

that is the whole purpose of this post and the reference to a dial indicator in order to accurately determine TDC, not to set ignition timing. Ignition or valve timing can then be set or checked once true TDC is established.

Alec
 
Hap, I'm not that confused, and I'm not working on anything at the moment - just asking out of curiosity. Also, I wasn't the one who asked the original questions - who may actually be working on something.
 
No problems... any experienced information is good information. But the guy who started the thread may need a PM to get the facts straight.
 
Easy: Don't waste money on it!
 
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