Author Topic: confirming tdc  (Read 524 times)

merrill

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confirming tdc
« on: May 19, 2024, 19:18:00 »
hello
beginners question, but wanted to confirm that i have the motor in TDC

#1 cylinder valves are at 11 and 2  (more or less)
distributor rotor is at 4 o'clockish
cam timing mark is at noon (top)
crank is at just after zero (around 4 btdc)

installing 123 disti and want to make sure i have this all correct

thank you in advance

Matt
Austin Tx
66 230 sl - "white"
78 300 D - Blue
98 C230

merrill

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Re: confirming tdc
« Reply #1 on: May 19, 2024, 20:14:58 »
hi,
so after reading other posts on tdc, i went back out an looked for the slash on my old disti.

ended up rotating the 123 180 degrees.  now the rotor and #1 line up.
Matt
Austin Tx
66 230 sl - "white"
78 300 D - Blue
98 C230

dirkbalter

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Re: confirming tdc
« Reply #2 on: May 19, 2024, 20:58:53 »
hi,
so after reading other posts on tdc, i went back out an looked for the slash on my old disti.

ended up rotating the 123 180 degrees.  now the rotor and #1 line up.

Sometimes it's more convenient, because of the ignition wire length and vacuum port location, to rotate the distributor drive instead.
Dirk
66 230 SL
70 280 SEL
53 CHEVY 3100
18 C300 COUPE
05 HD FLSTNI