GM Prizm/Nova 1985-1993 Repair Guide

Cylinder Block


See Figure 1

Most inspection and service work on the cylinder block should be handled by a machinist or professional engine rebuilding shop. Included in this work are bearing alignment checks, line boring, deck resurfacing, hot-tanking and cylinder block boring. Any or all of this work requires that the block be completely stripped of all components and transported to the shop. A block that has been checked and properly serviced will last much longer than one whose owner cut corners during a repair.

Cylinder de-glazing (honing) can be performed by the owner/mechanic who is careful and takes time to be accurate. The cylinder bores become glazed during normal operation of the engine as the rings ride up and down constantly. This shiny glaze must be removed in order for a new set of piston rings to seat properly.

Cylinder hones are available at most auto tool stores and parts jobbers. With the piston and rod assemblies removed from the block, cover the crankshaft completely with a rag to keep grit from collecting on it. Install the hone into the chuck of a variable speed drill (preferred in place of a constant speed drill) and insert the hone into the cylinder.

Make sure the drill and hone are kept square to the cylinder bore during the entire honing procedure.

Start the hone and move it up and down in the cylinder at a rate which will produce approximately a 60° crosshatch pattern. DO NOT extend the hone below the bottom of the cylinder bore. After the crosshatched pattern is established, remove the hone and check the piston fit.

Click image to see an enlarged view

Fig. Fig. 1: Cylinders should be honed to look like this

Remove the piston and wash the cylinder with a solution of detergent and water to remove the honing and cylinder grit. Wipe the bores out several times with a clean rag soaked in fresh engine oil. Remove the cover from the crankshaft and check closely to see that NO grit has found its way onto the crankshaft.