BenzWorld Senior Member
Date registered: Jun 2004
Mentioned: 0 Post(s)
Quoted: 17 Post(s)
Two things come to mind: excessive blowby and a bad diaphragm in the vacuum pump. Excessive blowby would mean the engine needs a rebuild, new rings and possibly pistons and sleeves. A bad vacuum pump diaphragm simply means a new diaphragm for the vacuum pump. You can easily check the vacuum pump by removing the line from the pump to the intake and seeing if there is oil in the line, or start the engine and see if oil spits out.
The hard starting leads me to believe you have low compression, and thus an engine rebuild is what is needed. The clearance between the piston and sleeve is only about 0.0015", so most likely there is a lot more slop than that, and it would need new pistons and sleeves too. An overhaul would likely run $1500 in parts alone, not counting labor for installing sleeves and valve work. You should also check the head and block for flatness and have them milled if necessary if you are that far.