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Post by timp4411 on Aug 1, 2022 19:20:53 GMT -5
Hi All.
I have twin Mercruisers in my 3860 Regal.
They are 8.1L HO. I want to change the oil and replace spark plugs.
My Manual states that the plugs are "AC 43-983". But several people have said to use the equivalent Plug made by Champion. Does that sound correct?
Can anyone provide the correct part number for the proper "Champion" plug.
And nothing in any of my manuals state the number for the Oil filters. Anyone know what those numbers are?
I appreciate the help !
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Post by faverod on Aug 4, 2022 10:42:48 GMT -5
Main engine Oil filter: PL15313
Oil: straight 20w-40 8.0 quarts
Transmission: 4 quarts
Generator: 1 quart 10w30
1.5” shafts anodes
R4 trim tab anodes
R3 rudder anodes
Serpentine belt: Mercruiser
57-865615-002
Spark plugs: NGK Iridium TR55IX
Kohler 7.3E
Generator spark plugs: NGK BPR4ES
Generator impeller kit: 359978
Generator oil filter: 359771 Kohler part#
Generator oil filter: PL14459
House battery SRM 8DA
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Post by timp4411 on Aug 4, 2022 11:31:33 GMT -5
Thanks for the info faverod ! I appreciate it.
I didn't get the Iridium plugs. I got the Champion Double Platinum plugs (7983).
Should I return them and get the Iridium?
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Post by cptbill on Aug 4, 2022 14:58:02 GMT -5
I for one have always used AC spark plugs in GM based engine
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Post by faverod on Aug 6, 2022 20:26:25 GMT -5
I think the general consensus from all my reading was people preferred the Iridium. That’s what I’ve been using and they seem to work well. Although those original Plugs lasted awhile so they can’t be that bad. My originals were pretty beat and causing a miss. I had quite a difference in power after changing to the Iridium’s. Just remember to not use anti seize on the new ones. I also changed out all my spark plug cables too. The Mercruiser ones are like $450+ per set. Volvo’s are about half that price. However Crusader 8.1’s are just over $100 per set if you want to do those too. Hope it helps.
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Post by timp4411 on Aug 28, 2022 13:51:00 GMT -5
Thanks everyone!
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Post by gofast24 on Sept 6, 2022 5:12:28 GMT -5
Thanks for the info faverod ! I appreciate it.
I didn't get the Iridium plugs. I got the Champion Double Platinum plugs (7983).
Should I return them and get the Iridium?
We still have the original Denso TJ14R-P15 Double Platinum double platinum in our 8.1's for 21 years/1100 hours and no problems! I would just use the ones you already bought ! |
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Post by gofast24 on Oct 17, 2022 11:09:47 GMT -5
Thanks for the info faverod ! I appreciate it.
I didn't get the Iridium plugs. I got the Champion Double Platinum plugs (7983).
Should I return them and get the Iridium?
platinum are fine 2001 4160 with VP 8.1's. 1130 hours and original plugs, no problems! |
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