Results 1 to 4 of 4
  1. #1
    skiversinc's Avatar
    Join Date
    Sep 2007
    Falmouth, Cornwall, UK

    Cracked exhaust manifold

    Any idea what would cause an exhaust manifold to crack?
    I finally got the ski back on the water yesterday, after nearly a year off the water.
    Tested it on the hose, running great. Got it on the water, running great for most of the day. Then, later on when I went out again from the beach, I was only getting 5000 rpm instead of the usual 7000! She was also getting quite unstable & twitchy.
    Got her into a nearby beach & found that the hull was almost full with water. Started her up in neutral to operate the bilge pump (without draining the battery) and found that there was water **ssing out of the side of the exhaust manifold, near, but not on, the joint of the main pipe.

    I've split the offending object off now & have found that the whole top section is nearly falling off with a 5" split down one side of the pipe and a crack virtually all the way round where the pipe bolts on!
    Any ideas as to what would cause this issue?
    I now need another exhaust manifold & gaskets to get her back on the water, but don't want the same thing to happen again.
    I will take some photos to try to show the split.

  2. #2
    skiversinc's Avatar
    Join Date
    Sep 2007
    Falmouth, Cornwall, UK
    Here's some photos to show the damage.
    Click image for larger version. 

Name:	P7234421.JPG 
Views:	26 
Size:	50.6 KB 
ID:	278255Click image for larger version. 

Name:	P7234425.JPG 
Views:	25 
Size:	65.1 KB 
ID:	278256Click image for larger version. 

Name:	P7234428.JPG 
Views:	27 
Size:	57.5 KB 
ID:	278257Click image for larger version. 

Name:	P7234431.JPG 
Views:	23 
Size:	77.8 KB 
ID:	278258Click image for larger version. 

Name:	P7234434.JPG 
Views:	25 
Size:	75.9 KB 
ID:	278259

  3. #3

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    Freeze damage?

    Incorrect bolt torque?

    Incorrect or missing spacer/washers on the lower mounting points?
    (Going from memory on this last one. I forget which engines have some flat spacers between the manifold bosses and the engine case)

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts