Spark Plug Compatible ?

[sjbfish]

I have a 2004 mercruiser 5.0L fuel injected engine and plan on replacing the spark plugs.<br />The mercruiser part number is 33-884019 which is a from what I can tell a AC 41-932 (Platinum) spark plug. The price range seems to vary dramatically for this plug. Does anyone know if these are the same or is there anything special for the marine engine ? The price range is 3 to 12 dollars a plug. ???

 

[Don S]

Re: Spark Plug Compatible ?

They are a special plug supplied by GM for the EFI engines. Stick with them.

 

[ron7000]

Re: Spark Plug Compatible ?

41-932 is a typical platinum plug, nothing special. It is oem for my camaro 5.7L.<br />Reason it will cost so much is because AC delco's part numbering scheme is F'd up! They change numbers for the same part across different applications. So to get that particular ACdelco plug with that number, if it isn't obsolete it will only be available from a GM dealer, because its ACdelco. And they'll rape you on price to begin with. If you're buying it from a marina, they're getting it from GM and then doubling the price on you.<br /><br />41-932 is not even a marine plug.<br /><br />cross reference is any plug that has 0.708" reach and 14mm threads, just about the most common plug for an American engine today. It is the same plug in my car, my 3.0L in the bayliner, and my 351w HO motor with GT40 heads.<br /><br />Cross ref for standard plugs are:<br />NGK TR55 for v-power, stock #3951<br />NGK BPR6EFS traditional, stock #3623<br />NGK TR55VX for platinum stock #2885<br /><br /><br />AC- MR43LTS<br />AC- MR42LTS (colder)<br />AC- R43LTS<br />AC- R32LTS (colder)<br />with AC, the "LTS" signifies the extra reach, at 0.708"<br /><br /><br />Autolite 764, platinum=AP764<br />Champ RS14YC6 stock #13<br />Champ RS14PYP6 stock #7013 for platinum<br />Bosch HR8DCX stock #7571<br />Bosch HR9DPX stock #4211 for platinum<br /><br />best bet it to go with either NGK or the AC-MR43LTS. Standard copper plugs are $2, the platinums will run you $2-4.

 

[Bondo]

Re: Spark Plug Compatible ?

best bet it to go with either NGK or the AC-MR43LTS .

Ayuh,............. Gotta Agree.............. <br /><br />The "M" in the part # stands for Marine,..............<br />It's an Alloy Bodied Plug,...... Little or No Rust..........

 

[paultek6]

Re: Spark Plug Compatible ?

stick with the platinums or by next year you will be doing a new motor because of melted ring lands and burned exhaust valves.<br /> Paul

 

[Don S]

Re: Spark Plug Compatible ?

Yes, the AC 41-932 is a platinum plug, and GM supplies them in the newer MPI engines. No it is not a marine plug, It is used and recommended by Mercruiser, Volvo, Kodiac, Marine Power etc. because GM recommends it ..... For a reason.<br />It is NOT a MR43LTS or anything like it, except it's a spark plug.<br />But replacing them with something other than a platinum just because it's cheaper is asking for problems on down the road.

 

[ron7000]

Re: Spark Plug Compatible ?

> or by next year you will be doing a new motor because of melted ring lands and burned exhaust valves<br /><br />> because GM recommends it ..... For a reason<br /><br />> something other than a platinum just because it's cheaper is asking for problems on down the road<br /><br /><br />you guys care to explain why?<br /><br /><br />I thought the "M" stood for more money.