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Not a everyday Hotrodder question...

3K views 20 replies 9 participants last post by  LATECH 
#1 ·
Hey guys,
Me and 5 of my friends decided to buy a boat as an summer project (Yes it was a big mistake lol), but now we have everything done, new plugs, electrical, lines ect...So for the first time we take it on the water, and we rev to about 1500 RPMS it starts to shake and past a certain point it'll backfire and pop and refuse to rev higher. Any ideas? Thought it might be from the Carb being too lean? Or fuel pressure? Its a 2.5L I4 Chevy with a 1BBL..Thanks! It also has a hard time turning over right after, we have to wait an hour or so for it to be able to turn over.The revs it was able to obtain got worse and worse
 
#21 ·
I guess we should have clarified the statement a little better. A few of us were under the impression that the engine would turn or "turn over" as you put it.. What you meant was it turned over but wouldnt start up...Right ?
Maybe we should develop a thread in general hotrodding about terminology and word usage so we all can get on the same page.
 
#15 ·
Has the outdrive been services? Does it have the proper lubricant? Do you have the proper...propeller? It sounds like its not the engine. If you blow the outdrive completely; its going to be a bad day. Take the boat to a marine mechanic and have them inspect the O/D. If you guys are fairly equipped mechanically, you can do the service yourself. Id see if theres a copy of the service manual on the web, and see if its something you want to tackle.
 
#18 ·
The mainshaft bearings in the outdrive (where the crankshaft hooks to) are a pretty good suspect. It turns all the time with the engine running . Ive seen several that had bad bearings and cause the loss of power from the engine when trying to operate the boat. When the bearings go bad , they can seize up,causing the engine to bog,also chewing up the housing as the locked up bearing spins in its bore.Not pretty.
It should be easy to check with the engine out.
 
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