Tear Down and Reassemble Unstarted 1.7 built to 2270, 1.7 to 2270 Unstarted 10 Year Old Build Options

[Robroe]

Moved from topic of first start of 10 year old build to tear down, inspect and reassemble. The 10 year old build is from a 73 1.7 to a 2270. Stroked to 78 mm and 96 mm cylinder diameter. Heads are Ham/RAT with 36 mm exhaust and 44 mm intake. Both are nicely ported.

Have torn it down to the case and checking crank end play before I split the case and pull the cam and crank. So far, everything is new and looks in good order. I'm concerned about oil passages being blocked with old assembly lube so a complete tear down and reassemble is happening. Discovered stacked cylinder spacers (4) totaling .150". So looking to replace those with single spacers. So far I can only find .160" spacers from type 4 store and may just use them as impact on compression appears minimal. Was shocked to discover crank end play is .450"! Sure glad I didn't try to start this thing. Will check again in the morning to make sure I'm checking it correctly, but I'm doing the same thing on the videos such as Ian Carrs YouTube engine builds so pretty sure I'm checking it correctly. Now to figure out what to do about that huge end play.

Any thoughts about what to watch out for?

[Superhawk996]

Eh . . . Sort of but not really.

Bottom line - remeasure end play prior to case disassembly until you get the hang of it and have a repeatable measurement. Did you by chance typo the end play by shifting a decimal place? Like maybe 0.045” rather than 0.450”?

You will reset it later but you need to be comfortable and consistently measuring it properly.

The crank end play is set by shimming the space between the flywheel and the axial thrust surface of the last crank bearing. So this can’t be set when the case is spit. However, it can be mocked up in a case half and you would definitely see where excessive crank play was coming from if bearings were completely jacked up.