2000 4.3 gm

[lynnboy021]

A friend of mine has a 2000 merc gm v6 4.3 and he said that his left side exhaust is hotter then his right....

He sucked up some sand n his motor overheated n melt the flappers n rubber, but he already replaced and flush the whole system.... He has the old one peace exhaust...,

 

[Don S]

Re: 2000 4.3 gm

Depends on how hot and how much difference. On muffs, or at idle in the water it's normal for one side to be warmer than the other, but they even out when load in the water.

 

[Bondo]

Re: 2000 4.3 gm

A friend of mine has a 2000 merc gm v6 4.3 and he said that his left side exhaust is hotter then his right....

He sucked up some sand n his motor overheated n melt the flappers n rubber, but he already replaced and flush the whole system.... He has the old one peace exhaust...,

Ayuh,... Don is of course, Absolutely Right,...

But, I'll add, that those manifolds are a Time Bomb waitin' to Destroy yer bud's motor....

They were Junk when New, 'n unlike fine Scotch, they ain't gettin' better with time...

 

[lynnboy021]

Re: 2000 4.3 gm

so i told him and he said that it started when he over heat the boat. but anyways he is oing to get the new ones anyways so lets see.. oh but i was reading somewhere that if he gets the new exhausts he might need a new t-stat housing???

 

[Don S]

Re: 2000 4.3 gm

so i told him and he said that it started when he over heat the boat. but anyways he is oing to get the new ones anyways so lets see.. oh but i was reading somewhere that if he gets the new exhausts he might need a new t-stat housing???

No need for a new thermostat housing, just plumb it in just like the single piece. The new ones will be 2 piece, but he will also need a kit as the exhaust Y is different.

Here is a service bulletin on the change,

View attachment 4.3Merc exhaust conversion.pdf

 

[lynnboy021]

Re: 2000 4.3 gm

Don S this is the kit he is going to buy Mercruiser Marine Boat Exhaust Manifold Kit 4 3L V6 99746 44354 1985 2002 New | eBay that will work right??? do you know whats the name of the kit he will need???

 

[Fun Times]

Re: 2000 4.3 gm

do you know whats the name of the kit he will need???

The info is in the service bulletin Don posted, look for Mercruiser part number 864293A02,
New Mercruiser Exhaust Manifold Conversion Kit 864293A02 | eBay

 

[Struc]

Re: 2000 4.3 gm

In order to match things up - you need a conversion kit, as was mentioned. Something like this:

Mercruiser 4.3L V6 Cast Iron Exhaust Single Piece Exhaust Manifold & Riser - Performance Product Technologies

 

[lynnboy021]

Re: 2000 4.3 gm

The info is in the service bulletin Don posted, look for Mercruiser part number 864293A02,
New Mercruiser Exhaust Manifold Conversion Kit 864293A02 | eBay

sorry i was on my phone and i did not see his service bulletin....