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Posts: 63
| I was changing the plugs in my newer 4 stroke Merc 9.9 because I had been doing a lot of trolling and the motor would not stay running at low speed as it had before. (Note I am also checking potential fuel issues..)
Anyway, I went to take the old ones out using an 18 mm deep well and it seemed to be too big, but I put it on one of the new plugs and it seemed to be the correct fit. I pulled out my 5/8 and it worked to take the old plugs out. When I went to put the new plugs in the 5/8 was too small so I used the 18 MM and they went in just fine.
So I looked at the plugs and the set I took out of the motor was DCPR6E. The ones I put back in were DCPR6E A9. I like to do my own research and I was trying to look up and see (other than the wrench size needed) if there is any difference in the two and if I can use the DCPR6E A9 instead of the DCPR6E. Note: before someone says, "what does the manual say?" I have read the manual and it calls for the DPR6E, but I am wondering if the DCPR6E A9 will work because i purchased several of them thinking they were the correct ones.
Any input on the difference between the two would be appreciated and if I can use the DCPR6E A9 would be appreciated. Thanks very much.
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