I was inspecting the #22 head I have for my SDL rebuild and noticed that the feel of one of the hydraulic valve tappets was extremely soft. I removed the tappet and the insides fell out.

Luckily I found the spring inside. I have not fooled with hydraulic valves before so I'm new at this. There's a guide sleeve, compression spring, and plunger. There are instructions in the FSM regarding reassembling and installing, but I'm not sure if I understand.

How do I know if this is a bad tappet, and how do I put it all together?

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)