REF: Tools - 135 - Sportsterpedia

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====== REF: Tools - 135 ======
====== For Finding Piston Top Dead Center (TDC) ======
See related procedures for [[techtalk:ref:trouble05#reftroubleshooting_-_engine_-_05|Finding TDC of the Piston]] in the REF section of the Sportsterpedia.


===== With the Head On: =====

==== Using a Straw ====
This is not accurate enough to find True TDC. \\ 
However, true TDC is not always necessary to find depending on circumstance. \\
You can use a straw through the spark plug hole to measure when the piston is close to TDC with the rocker box on or off. \\
The straw is soft enough that you won't risk breaking anything if it gets squished between the piston and the head / valves. \\ 
See procedure and cautions for [[techtalk:ref:trouble05#find_tdc_using_a_straw|Finding TDC with a straw]] in the REF section of the Sportsterpedia.

|A straw in plug hole for finding TDC ((photo by Hippysmack))| 
|{{techtalk:ref:tools:tdc_with_straw_-_single_or_dual_plug_heads_by_hippysmack.jpg?direct&300|}}|

===== With the Head Off =====
==== Using a Dial Depth Gauge ====

|Loosen the thumbscrew to allow you to turn the face \\ (with a slight drag) ((photo by Hippysmack))|Place on a flat clean machined surface or a mirror, \\ turn the face to read "zero", lock the thumbscrew. ((photo by Hippysmack))|Set the base edges on the flats of the deck and drop \\ the center probe on the piston to measure \\ 'differential' from zero while turning the engine \\ to find TDC ((photo by Hippysmack))|
|{{techtalk:ref:tools:dial_depth_gauge_3_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:dial_depth_gauge_4_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:dial_depth_gauge_5_by_hippysmack.jpg?direct&300|}}|
|:::|Double check the reading before proceeding|Double check the reading before proceeding| 

\\

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Trace: • REF: Electrical System • REF: Tools - 166 • J • REF: Tools - 130 • REF: Engine Mechanicals - Sub-05K • IH: Transmission & Final Drive - Sub-03F • E • M

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