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Originally Posted by sdelasal
So is there anyone who has actually done a leakdown test and can comment on whether it is necessary to lock the engine somehow? I can't see how you can get each cylinder at exactly tdc and then apply 100+psi - the engine position will be out by a little & the engine will rotate - that's what I think - but i've never tried it.
Has anyone tried it ? Do you have to fiddle for hours getting 'exact' tdc - or am I making a lot of fuss about nothing!
Steve
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No, it's not fuss about nothing, Steve. No question is. TDC can be found by observing the valves (with the cover off), and by looking at the piston if the injector hole allows. To do it with any precision means a dial indicator is mounted to measure the precise moment of movent for the valves or the indicator is used with usually special tools that allow a setup to measure the exact position of a piston. Which method works best depends on the particular engine.
Or an engine can be immobilized too by a variety of methods. One uses a specially designed tool that will lock against the flywheel or torque convertor ring gear and bolt (usually) to the bellhousing.
For diesels particularly the method is often a factory procedure using factory designed tools that only have that purpose.
i'm answering with gneralities because each engine probably requires it's own instructions. But yes, it can be done without what you said.
