Checking the valve guides (Scorpio 2)

When repairing a cylinder head with leaky valves, it is not enough to clean the valves and valve seats or replace them. In addition, the valve guides should be checked for wear immediately. This is especially important for engines with a long service life. Worn valve guides do not ensure the valves are centered relative to the seats and cause increased engine oil consumption. If the wear is too great, the valve guides must be replaced (service station work).

Shine valve.

Clean the valve guide with a carbon cleaner.



Insert the valve into the guide and determine the presence of a gap by pressing the valve in the directions shown by the arrows. There should be no gap.



Measure the clearance using improvised means: place a steel square against the cylinder head and press the valve against it. Move the valve to the square and back, and measure the clearance using feeler gauges.



If the gap is greater than that specified in the table, the valve guide holes at the service station must be processed with a reamer of the subsequent repair size. The processing must be started from the combustion chamber side.

Caution: If the valve guide holes have been reamed, the valves must be installed with an allowance in any case.