496 HO Spark Plugs
 

Hello,

What is the recommended interval to change the plugs on a 05 496 HO?

Thanks

Re: 496 HO Spark Plugs
 

sorry

Re: 496 HO Spark Plugs
 

I am not one to plug HO's. :D

Re: 496 HO Spark Plugs
 

that soon to change the plugs? thats another 220 a year.

Re: 496 HO Spark Plugs
 

???????

Re: 496 HO Spark Plugs
 

220 a yr for plugs ...... and what are you spending for fuel????

sounds cheap to me



can afford the maint... guess you cant afford the boat

do it right or dont do it

Re: 496 HO Spark Plugs
 

I do full tune ups to my boats yearly. This way it's always running most efficently & I dont have to worry about stuff siezing as much either.. Its cheap insurance.. :)

Jamie / lakeside

Re: 496 HO Spark Plugs
 

The AC plugs for the H.O. are 18 bucks a pop ,,, the equivalent NGK's are 9 bucks a pop, and I swear by NGK's so 75.00 for plugs isn't gonna break the bank...

Re: 496 HO Spark Plugs
 

that was a little uncalled for. dont worry about what i spend for fuel. it was just a question. a$$

Re: 496 HO Spark Plugs
 

I hope you are not getting these plugs through the Merc. dealer. Much cheaper at the local GM dealer.

Re: 496 HO Spark Plugs
 

What is the plug number through GM? Thanks, I need to replace mine, but boat is in storage, and want to have them the next time I go out.

Re: 496 HO Spark Plugs
 

When plugs were pulled at 200 hours they looked perfect. It was an unnecssary change and there are 2 plugs that are a bear to get to and get out because of excellent engineering.

Re: 496 HO Spark Plugs
 

Mercruiser service manual says to simply "check" spark plugs/wires every 300 hours or 3 years. Later in the manual it refers to inspecting both and says look for cracks, general condition etc., and to pull inspect, re-gap plugs. Unless you're experiencing problems changing plugs/wires before their time is overrated. Same with cars, trucks, etc. Wanna change something very frequently, do the engine & drive oils. That's what will ruin your day.

Re: 496 HO Spark Plugs
 

Thats true. Todays fuel injected engines run very clean.
Changing plugs every 60 hrs is a waste.

Re: 496 HO Spark Plugs
 

Platinum tipped plugs that come stock in the 496's should go at least 200-300hrs with good fuel and engine running properly. Be careful how you clean them, the platinum tips are very fine and can be easily damaged, keep the gaps at .060" and don't blast or wire brush them, alcohol or Berrymans and a tooth brush are adequate.
We cary these AC Delco plugs in stock and we sell them for $7.00 per plug while supplies last. We also have about 6 sets of stock new take off plug wire sets that we are selling for $75.00 per set. All plus UPS.

Ray @ Raylar

Re: 496 HO Spark Plugs
 

Good info Raylar. I'm at 177 hrs so I have a ways to go and the motors are still running very smooth (knock on wood; "knock" "knock"). As time passes by and the earliar model 496's reach the 3-400 hr mark those plugs/wires are soon to become a hot commodity as will everything else about these motors.

Re: 496 HO Spark Plugs
 

Here are the results of a little research I recently did and emailed to my club:

My motors currently have Denso #TJ14R-P15 plugs. No auto parts shops seem to carry them locally. Lynnhaven Marine has them for $10.71 each – Volvo part #386127. (Not sure if it is the exact same Denso plug.) Sparkplugs.com has them @ $6.80 each. They cross reference NGK #PZTR5A-15 as a match @ $11.71 each. Rodney ordered his plugs through a Merc dealer; part #33-863622001 for wholesale at $12 each. The plugs he got are AC Delco #41-983. LMC retails them for $17.27 each. They are available at Advance Auto for $5.98 each.

I plan to stay with the Denso plugs.