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?

[914sgofast2]

In looking at the cam, I noticed that there are no lock washers of any style under the cam gear bolts. Aren't there supposed to be some type of lock washers under those bolts?

My Webcam kit (bought from the Type 4 Store) came with lock washers for them. What's the consensus of the 914World brain test on this issue. If you are not going to use any lock washers, should you use red lactate on those cam gear bolts for peace of mind?

As to the origins of the case, that is an EA series engine case with the cast in supports for the oil windage tray, so it is from a later 1.7 liter engine, not a 2 liter engine. One of the better cases to use when building a big bore engine, although Jake Ray says that the earliest 1.7 liter cases are the very best because they have no openings at all in the main bearing saddle webs like the later cases do.

[Superhawk996]

In looking at the cam, I noticed that there are no lock washers of any style under the cam gear bolts. Aren't there supposed to be some type of lock washers under those bolts?

My Webcam kit (bought from the Type 4 Store) came with lock washers for them. What's the consensus of the 914World brain test on this issue. If you are not going to use any lock washers, should you use red lactate on those cam gear bolts for peace of mind?

Common helical coil style lock washers are useless. See the NASA white paper for details on other styles of lock washers.

A properly torqued fastener doesn’t need a lock washer. Would rather see a flange head bolt used instead of plain hex head but I’ve also seen plain hex head used on these cam gear bolts for years without issues.

Personally, I do use red loctite on the cam gear bolts at assembly as insurance.

NASA Fastener Design Manual, 1990 excerpt:



https://ntrs.nasa.gov/api/citations/1990000...19900009424.pdf