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MX5 Miata Tech Forum

Freeing sticking hydraulic tappets

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Rewind Les W
Leeds, Yorkshire, UK   GBR
If you have your cylinder head in bits for lapping in valves etc. it is well worth freeing off each of the hydraulic tappets. Get a can of Wynns hydraulic tappet cleaner (normally supposed to be added to the engine oil) and put a small amount, enough to cover one of the hydraulic tappets in a small glass bowl. Put the tappet in upside down so that the plunger that bears on top of the valve is facing upwards. Using a flat ended punch or a piece of metal, pump the small plunger in the centre of the tappet up and down a few times to expel any air from the tappet and leave it to soak for a couple of hours. Pump it again a few times to expel dirt (see photo), take it out, wipe it and transfer into another glass bowl filled with fresh engine oil. Pump it up and down again to expel more dirt and to fill the tappet with fresh oil. Repeat for the 15 remaining tappets. Make sure each one is put back in its correct location, i.e the same valve it came from.

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DSCF2256.JPG    58.3 KB

Rewind Les W
Leeds, Yorkshire, UK   GBR
In the photo you can see the dirt starting to come out, there was much more than this when I finished.

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