Big questions that don't necessarily have concrete answers. I won't really know what I need until the mechanic opens it up. But, I'm trying to set up a tentative parts budget.

Compression is 350/350/350/250 wet. Harbor Freight gauge read 290 across the board dry before #4 went. Also has a leaky rear main seal. Oil consumption not checked after the sudden drop in #4 but was 1 quart per 800 miles. I suspect most wasn't burnt, rather leaked from the rear of the engine. Still fires up first crank with 30-45 seconds of glowing on cold days.

The car has ~ 190,000 miles.

The long block was replaced ~ 130,000 miles ago. Head was not resurfaced or rebuilt at that time. So, 190,000 on the head.

New timing chain and injection pump rebuilt 12,000 miles ago. Injectors about the same time.

Water pump replaced 2,000 miles ago.

I figure that I'm out a complete head build. Possibly a new sleeve in #4, maybe all. I'm hoping that pistons and valves can be salvaged. Cam and rockers look ok to my shadetree eyes.


I figure that I'll need at least the following:

Complete gasket kit (with valve seals and front main and rear rope seal)
Piston rings
Valve guides
Main bearings
Rod bearings
Head bolts
Connecting rod bolts and nuts
Piston sleeves
Valve springs?


Possibly - new pistons (includes rings and wrist pin), new intake and exhaust valves (sodium exhaust valves still?)


Should I consider a new timing chain kit even though the old one is fairly fresh? Reinstall the water pump instead of replacing?

What else? What little things am I overlooking (precombustion chamber shims, etc.)

__________________
1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.