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pietro
Member
Username: pietro
Post Number: 8
Registered: 06-2009
| | Posted on Wednesday, October 21, 2009 - 01:03 pm: | 
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hi there, I have completed the restoration of a Boesch 510, put the rebuilt CC 283 in it, fired it regularly, but it has something like a piston beating, both at idle and higher rpm, and after 15 minutes the right bank exaust puts steam. Maybe something concerning a deformed piston? |
bluecometk
New member
Username: bluecometk
Post Number: 3
Registered: 10-2009
| | Posted on Thursday, October 22, 2009 - 07:51 pm: |
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I watched your video. I can’t determine if the engine has any knocking sounds because that cameras angle only lends itself to exhaust sound.
By the way Very beautiful boat and Resto work
What I can determine from the video is that it sounds like you have one or more cylinders misfiring at idle and under partial throttle.
It also seems like it starts/tries to pick up a cylinder when you revved up the engine.
The water flow looks ok form both sides.
Pull the sparkplugs out and mark what cylinder they came from on the insulator with a grease pen so you can verify any issues with that corresponding cylinder
Replace the sparkplugs, Make sure you gap them tight to the spec. If you can get A/C Delco plugs they will run better than Champions in that engine
If you have a single points type distributor set the dwell (dwell angle is 29 to31 degrees) and check/set the timing. It sounds a little retarded or late.
Make sure your wires and Rotor, Dist cap don’t have any carbon tracking on them because this will cause a short and resulting plug misfire. Make sure you have spark to all cylinders.
You may also want to look at the Carb idle screws and turn them a ¼ turn out and then a ¼ turn in and see if when doing this you get and better idle quality.
If you can take another video, try taking an overall close up of the engine then hold the camera or microphone over the top front of the engine then the rear top of the engine and then hold the mike /Camera down low on each side of the engine. This will give a better sample to diagnose by.
Post back what you find if this all turns out ok and it still is misfiring then you may have mechanical issues like burned/ sticky valves, cylinder/piston/head gasket issues.
Note a cracked /bad exhaust manifold can cause a misfire
Hope this helps
These are just my opinions
Bluecometk. |
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