#36 Spark Plugs

After Seafoaming the engine, the spark plugs were replaced.

After removing the old plugs, cylinder compression was checked again to see if Seafoam made any difference.  Not much; the numbers are perhaps slightly higher overall:

Cleaned out the spark plug wells in the cylinder head with cleaner and a rag as best I could.

The 5/8″ (16mm) magnetic swivel spark plug socket by Gearwrench (in photo) is great!  I like the captive extension and magnetic feature a lot.

Used genuine Volvo plugs which are fairly expensive, although there is vigorous debate about which plugs to use.  Seems the consensus is that Volvo plugs are best so I went with that.  These appear to be platinum- or Iridium-plated plugs with triple ground electrodes permanently gapped.  Compared to original single ground electrode copper plugs:

Put all five new plugs in

And tightened to specified 18 ft-lb torque

Fired the engine up and it runs smoothly.

$24.32

Tags: spark plug