My y8 threw a rod a long time. Just got done rebuilding a y7 to put in. Put it in and it's knocking. I'm using the y8 head. All internals are torqued down properly. The crank is fine. Rings are good. Rods are straight. Anybody have an idea as to what is going on?

 

is it knocking when you start it cold?
if so does it go away after its been runing for a lil while?

 

Haven't actually tried that. Having some problems with the radiator so i turn it off when the temp gets high.

But what are you thinking?

 

He is probably asking about the cold because he thinks it could be "piston slap".

This happens when there is horizontal movement of the piston as it travels vertically up and down the bore. It is caused by worn internals, and you can usually see marks on the cylinder wall where the knocking occurs. Once the engine heats up, the piston changes shape slightly, expanding to fill the bore, thus stopping the knocking.

 

check that.
if it goes away your fine. well not for ever but alot of hondas do it,
my y7 does it almost every day and its 195k and still runin strong.

 

alright.. about how long does it usually take for yours to go away dx?

 

Mine goes away between 1 and 5 minutes, depending how cold it is prior to starting.

 

on avrage mine does the same
it sounds some what like a rod knock but goes away
rod knock will not.

 

bump. so it's not a piston slap. Anybody?

 

bump.

going to buy a stethoscope in a little while.

 

Sounds to me like you didn't get the right rod bearings or something.

 

just use a screw driver, (but be careful) put the handle to your ear and put the metal to where ever. works great =P

 

Yeah, that's a good idea and cheaper than the automotive stethoscope...

 

did you assemble it?
where the parts used?

 

not sure i understand the question

 

he is asking if you put the motor together yourself and were the parts that you used to have it put together used or new parts?

 

ah ok. yeah i did. first time doing it too. all new parts but rods and crank. and head.

just listened to it, sounds like it's coming from the side of the motor, around the water pump

 

up.

can a water or oil pump make a knock?

 

possibly,,,
pull it off and check it.

 

anybody know for sure of a way it could?