There is NOTHING better at assembling plastic and rubber parts. This stuff is amazing. Used it extensively on my 87 560SL -P-80® Emulsion Temporary Assembly Lubricant is a biodegradable assembly aid that eases installation of tight-fitting rubber and plastic parts by reducing the force needed for insertion. Once assembly is complete, the lubricant dries and the part returns to its original condition.
You didnt mention that when you take the oiler rail off to check into the cam housing holes to see if their are any plastic pieces left in the holes. Just use a touch of oil on the plastic to install.
