I'm slowly gathering parts to replace my cylinder head on my 85 300d to find the source of a knock coming from the head.

I was wondering if I could slip out the pistons and replace the rings without getting uneven compression.

The bottom end is new but I never touched the pistons before.

I don't have the money or time to replace the sleeves, so it would be half a rebuild.

Compression is fair and the motor is seating at about 160k.

Also, how hard is it to replace the wrist pins.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800