low compression, what to do?

[18CrewDually]

thanks. i never pulled the engine. using the same pistons. think i got wrong sized bearings

Ok. Bearing should be stamped STD for Standard size. Each set should be set in its rod, caps installed and torqued, then measured to check for proper clearence with the crank. This is done before install into the block. Sounds like you are a couple steps ahead without checking bearing clearence. Best of luck.

 

[JURO]

Ok. Bearing should be stamped STD for Standard size. Each set should be set in its rod, caps installed and torqued, then measured to check for proper clearence with the crank. This is done before install into the block. Sounds like you are a couple steps ahead without checking bearing clearence. Best of luck.

thanks

 

[18CrewDually]

As seen here. STD. is Standard size.

 

[JURO]

As seen here. STD. is Standard size.

thanks i did not know about that

 

[JURO]

As seen here. STD. is Standard size.

would the head gaskets still be good even after the heads were fastened down but not torqued to spec?

 

[18CrewDually]

would the head gaskets still be good even after the heads were fastened down but not torqued to spec?

If you tightened down at all at this point I'd probably swap out the bearings one rod at a time and see what you got instead of the chance of the gasket being unusable. I hope you cleaned the mating surfaces well. You do not want any contamination on the block or heads. And use a razor to scrape it clean, NOT an abrasive that removes metals and potentially ruins the mating surface.

 

[JURO]

If you tightened down at all at this point I'd probably swap out the bearings one rod at a time and see what you got instead of the chance of the gasket being unusable. I hope you cleaned the mating surfaces well. You do not want any contamination on the block or heads. And use a razor to scrape it clean, NOT an abrasive that removes metals and potentially ruins the mating surface.

i used a clean cloth soaked in gasoline to clean & wipe all mating surfaces.

 

[18CrewDually]

You should of done more homework.
Hope it all works out.

 

[JURO]

still binding after I replaced all bearings with standard size, & made sure all was clean.
should i try undersize bearings?

https://www.rockauto.com/en/catalog...v8,1366590,engine,connecting+rod+bearing,5212

 

[JURO]

You should of done more homework.
Hope it all works out.

still binding after I replaced all bearings with standard size, & made sure all was clean.
should i try undersize bearings?

 

[18CrewDually]

still binding after I replaced all bearings with standard size, & made sure all was clean.
should i try undersize bearings?

Are you installing them correctly with the tang? You'll need to mic the crank and measure the assembled rods to see if you got the right bearings and propper clearances. Hard to see what you got going on over the internet.
So is it a particular rod that binds on the crank when it is torqued or each one will bind?
Are you sure it is binding? You need to get calipers and get some measurements. Do you have a local engine builder that could take a look? Like I said it's tough doing this on a keyboard.

 

[JURO]

a cylinder wall has a scratch on it, it was deep enough to catch my fingernail.
after i honed the cylinder, the scratch is still visible but now it feels smooth.
is it okay?