RCU Forums - View Single Post - Electronic solutions to modifying glow engines of all sizes to gasoline
Old 08-23-2022 | 06:26 AM
  #498  
John_M_'s Avatar
John_M_
 
Joined: Jan 2014
Posts: 1,509
Likes: 0
Received 10 Likes on 8 Posts
Default

Originally Posted by 1967brutus
The question about the rod cap bolts is a good one, and one of the few I do not have a direct answer to: Every engine workshop manual I have ever had my grubby little fingers staining the pages, had ample warnings on how to handle these bolts (torque, lubricating before assembly or not, reewal at each dismantling, etc etc) but the ASP manual says nothing about it, nor did I ever get any specific info about that from any vendor. Can't remember Dave McIntyre (the YT guy that has hundreds of engine disassembly video's on his channel) ever mentioning it. So whatever follows is based on logic, not on hard info.
AFAIK those bolts were never sold separately, So I assume renewal is not necessary. I also do not remember any scary stories from people that disassembled one and afterwards had issues with rods letting go.

So I would say reuse the bolts, do not loctite them, but torque them as accurately as possible. Of course, the caps needed to be kept with their individual rods, and fitted back in the same orientation, and preferrably keep the rods to their original crankpin as well, just to be on the safe side.

Be glad you have the ASP. To the best of my knowledge, the ASP has straight bearing sizes. The OS appears to have one odd sized bearing that is hard to find.
Get bearings of C3 clearance class for the crankshaft. The cambearings can be C2 ("standard" clearance)
You remember what happened to David's ASP boxer after he did a dismantle / review of his NIB 160 boxer... I think that video is still on youtube... it was most unfortunate, but a good reminder to check and recheck all internal fasteners... I don't recall if he forgot to tighten the rod cap screws or he over torqued them, but no room in that crankcase for jiggly parts.

Last edited by John_M_; 08-23-2022 at 06:32 AM.