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  1. shuckerdaddy

    mercruiser 140 low compression & cracked exhaust manifold

    Update March 4th: Machine shop resurfaced head + new valves + hardened seats. They commented the head was in excellent shape internally, but needed the valve job. I had them throw in hardened seats while it was there. Cleaned up decking on block with razor blades and found a small torched...
  2. shuckerdaddy

    mercruiser 140 low compression & cracked exhaust manifold

    Gasket removed, but not cleaned yet.
  3. shuckerdaddy

    mercruiser 140 low compression & cracked exhaust manifold

    Update February 16th (originally posted: Jan 22nd) Didn't have access to an air compressor and decided to forego the leak-down test. Ended up buying an inexpensive borescope. Was able to identify a blown head gasket using the scope inside the cylinder itself. I successfully removed the head...
  4. shuckerdaddy

    mercruiser 140 low compression & cracked exhaust manifold

    Thanks for the quick reply - I really appreciate it. Definitely original engine from 1969 - I found the crack in the exhaust manifold on the underside (see photo). I don't think a quick JB Weld job would cut it for this crack - I'm probably going to look into a replacing the manifold entirely...
  5. shuckerdaddy

    mercruiser 140 low compression & cracked exhaust manifold

    Just wanted to say thank you to this forum - I bought my first project boat last year and wouldn't have her running without all the great threads here. About the boat - unsure of prior owner's history of winterizing...Also shame on me for not doing a compression test. Bring on the comments...
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