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    Starter Motor Replacement Or?

    Hi Everyone, I have a 400 Express Trojan with 2 Mercruiser 8.1 S engines. One starts just fine cold. The other one does the normal beep and I hear the fuel pump light up when I turn on the ignition, and I hear a good "Click" which leads me to believe that the solenoid is operating but the...
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    Mercruiser 8.1S Aluminum Exhaust Manifold Failures

    I had to replace the risers, elbows, and aluminum exhaust manifolds on two 8.1S Mercruiser engines due to raw water intrusion in the manifolds. Fortunately it had just shown hints of leakage and the engines were fine. The total cost was over $5000. Just this week I came across this thread...
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    Do You Use Resonators in Your Exhaust Lines?

    Last weekend I blew a hole in 1 exhaust hose in each of the two engines. These are 496 Horizon engines that have one 3 foot exhast hose from each elbow going down to the muffler (2 - 3' hoses per engine). The hoses are several years old and both blew holes in the top of the hoses about 6"...
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    Diacom Test Need Help

    I recently replaced the sea water pump impellers on both 496 Horizons. A Diacom recording on both engines showed normal sea pump pressure. I then pulled both raw water sea strainers and cleaned them out. Nothing to speak of was caught in the strainers. As soon as I replaced the strainers and ran...
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    Fresh Water Flush Kit or Volvo QL Neutra-Salt

    Hi Everyone, I just finished having new exhaust manifolds and risers replaced on 2 Mercruiser 8.1s 496 inboards. The boat is a 40' Trojan and spends its life in salt water. The previous setup had aluminum manifolds which after 3 years had practically fallen apart (Mercury has since gone...
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    How Much Drop From Elbow to Muffler

    Hi Everyone, I am replacing the manifolds, risers, and elbows on Mercruiser 8.1S Horizon engines. The reason for the replacement is because the elbow/riser studs continually stripped out of the aluminm manifolds (previous post), and now Mercury has gone back to cast iron manifolds. The...
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    Riser Stud Problems Mercruiser 8.1L

    Hi Everyone, New to this forum and hope someone out there has experience in this area. I have a 40' Trojan / Carver Express with 2 Mercruiser 472 8.1L engines. I continue to have problems with the riser studs stripping out of the manifold. The risers appear to be installed correctly and I...
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