mercruiser 8.1 horizons

I have two MerCruiser inboard engines on my Sea Ray 420 Sundancer. Each of the engines has attached to it a small blue bicycle pump and on each engine there are air valves similar to what you would see on a bicycle or automotive tire. It’s always been a mystery to me what the valves do and if...

Last Fall, one of the transmissions failed. Upon inspection, the trans oil resembled strawberry milk. The trans cooler had failed. I did notice, what I thought, was a gasoline sheen on the water at the exhaust but thought it was related to running rich. Painful lesson. I'll be replacing...

2005 Merc 8.1 Horizon's with aluminum exhaust manifolds I have a 2005 340 Sundancer. I just discovered salt water intrusion from a hole in the aluminum exhaust manifolds. New versions of this engine comes with cast iron manifolds. I did not expect this to happen after 4+ years. Has anybody...