Mercury recommends changing the plugs every 300 hours or 3 years, whichever comes first. That being said, if you're performing winterization and they look excessively worn or you're experiencing running concerns, you should change them before the recommended period.
So the Numbers on the spark plug boot housing 1-4 don’t correlate with the # where the spark plugs are threaded in? They are numbered on the motor also 1-4. They are not strait across if you match numbers. So , I am confused which is the right way.
The cylinders are numbered 1-2-3-4 starting with the top cylinder being #1. The white numbered tags that are shown on the ignition coils guide you as to which cylinder/spark plug that plug wire should be installed. On this particular engine, the top ignition coil handles spark for the middle two spark plugs (#2 & #3), and the bottom coil handles spark for the top plug and the bottom plug (#1 & #4).
The warranty and operation manual for the Mercury Marine 40-60hp engine line does not suggest applying anti-seize to the spark plugs before installation. We always recommend referring to the manual that was supplied with the product you own and following the steps outlined within.
How often do you change the spark plugs? Hours on engine or just replace every year or so?
Mercury recommends changing the plugs every 300 hours or 3 years, whichever comes first. That being said, if you're performing winterization and they look excessively worn or you're experiencing running concerns, you should change them before the recommended period.
So the Numbers on the spark plug boot housing 1-4 don’t correlate with the # where the spark plugs are threaded in? They are numbered on the motor also 1-4. They are not strait across if you match numbers. So , I am confused which is the right way.
The cylinders are numbered 1-2-3-4 starting with the top cylinder being #1. The white numbered tags that are shown on the ignition coils guide you as to which cylinder/spark plug that plug wire should be installed. On this particular engine, the top ignition coil handles spark for the middle two spark plugs (#2 & #3), and the bottom coil handles spark for the top plug and the bottom plug (#1 & #4).
If you removed inspected plugs and all was good what would you to to reinstall them since they have already been torqued down originally
Yes, spark plugs can be reinstalled and torqued to the specified setting again after inspection.
Just want to be clear, no indexing is required correct?
Correct. Spark plugs do not need to be indexed on the 40hp - 60hp Mercury engine family.
Looking for 40 hp video. Can’t remove 3rd ignition coil. Can’t get at the Lowest plug!
On some engine models, a combination of a ratchet extension and a swivel placed near the socket may be necessary.
The 40, 50, and 60 are all the same displacement, same designs, so makes no difference which HP.
I hear you, the lowest plug is a sod to get at. Will try as they suggest ext. and swivel. But why do the design engineers do this 😩.
No mention of anti-sieze, I thought it was recommended to be used.??
The warranty and operation manual for the Mercury Marine 40-60hp engine line does not suggest applying anti-seize to the spark plugs before installation. We always recommend referring to the manual that was supplied with the product you own and following the steps outlined within.
@@QuicksilverProducts Its definitely mentioned on 50 hp models. Its even on the reminder sticker next to the 1 year maintenance list.