496 intake deposits
After removing my flame arrester to clean it I was surprised when I noticed a heavy deposit of black tar on the throttle body plate. There was also a smaller amount on the inside when I opened the throttle and stuck my hand in. It's a 2004 496 mag HO with 190 hours. I can imagine there's some of that now on the valves and throughout the intake manifold.
Does anyone else use a engine cleaner like the Mercury power tune on this engine? I used to use it on my old carbed 454 now and then but I'm just not sure how the EFI will like it. It's nasty stuff. |
It is belt dust combined with moisture, oil and whatever else...
Replace the belt, tension it correctly and it will decrease dust. There are a few threads talking about this. you may want to clean your pullies with a wire brush before the new belt goes on. Some 496's have more dust... I think some pullies arent aligned as well as others. The TB comes off with 3 nuts. It might be a good idea to pull it and clean it. Or, take your time with a rag and some throttle body cleaner. (any cleaner, carb, brake, laquer thinner) |
That's really interesting. I think you're right. I just replaced the belt last season and I've been having a lot of belt noise since.
I replaced the 3 idler pullys thinking the noise was from there but I discovered it's the new belt. I had crossed referenced it at NAPA so it's not a Mercrusier belt. Thanks! |
Yeah, that is probably the issue.
Does it have the idler pulley for tension or the adjustable alternator bracket? |
adjustable alternator
I ordered a Mercursier belt and a K&N filter today. At least the filter will keep the junk out. |
The belt tension is tighter than what you think. Very little deflection. Clean the pullies with a wire brush.
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