Knocking under a load

[Robert D]

Re: Knocking under a load

Not quite a dead give away, Robert! Sometimes with loose rod rollers (for whatever reason), the engine will idle fine but upon acceleration, the rollers will slide over the crankpin rather than roll, and give a screetching sound. Sometimes they will rattle. Detonation sounds like a rattle while bad bearings generally sound like a deeper knock. So when someone describes a knock, never assume anything without questioning every possibility.

This is probably why doctors won't make a diagnosis over the phone and offer prescriptions But we try it here!

 

[Frank Acampora]

Re: Knocking under a load

Yeah! New members may wonder why sometimes we don't hit it on the first or second try, but I have learned that trying to solve any but the simplest problems on line is way more difficult than I thought when I first joined. I will admit that sometimes I won't answer right away but ponder the problem a bit and sometimes other peoples answers start making connections in my thinking.

 

[1983rinker]

Re: Knocking under a load

Got new lower unit on her now. I ran it the other day and all seems good on new LU. Now im repainting it to match upper leg. I had a 2.1 but I think I got a 1.7 now so I lost 4 mph on top end.

 

[1983rinker]

Re: Knocking under a load

Did a swap of lu agin. Now I can hit 33mph no prop. So I got my 2.1 back. I had it out today. Got it up to 34. It ran like a champ.