1967/1969 Bonnie Rebuild Desert Sled Project - Any Advice

Hydro blasting advice. I am going to take my engine parts to be hydro blasted. I am curious as to which parts can withstand this process. Obviously the cast engine cases - but does anyone also have the covers blasted? Or is this something that ruins them? Thanks for any advice.

 

darkman, got it - thanks. By the way, my head is painted black. My hydroblaster wants all oil, gaskets, paint and crap off the pieces before he will blast them. Do you have any advice about removing paint, as well as carbon from the combustion chambers? I am planning to get the head blasted before sending it out to get rebuilt.

 

Thanks for the advice. Seems like a good solution.

 

Tappet oil drillway advice needed.

So I purchased an AERCO big bore kit to replace my aged Routt. On the old Routt there was no exhaust tappet oil feed driveway, and the right side engine case had the oil driveway plugged. Additionally the exhaust tappets in the engine had no machined cut out or oil hole.

The AERCO cylinder has an open, exhaust tappet oil feed drillway. So what is a good way to proceed? Should I open up the right side case driveway, and buy new exhaust tappets with the machined part and oil hole? Has anyone had experience with this kind of situation?

Thanks!

 

OK, thanks. So the oil drillway in the case is already plugged. Do you have a suggestion on how to plug the drillway in the cylinder?

 

Speedrattle - forgot to answer this earlier - yes, tight in the piston, not the rod.

 

Cams and Bushings.

I ordered from Classic British Spares a set of sintered bronze bushings for my 1969 T120R. 3 of the bushings seemed to be right on as to size, etc. 1 of the bushings, the drive side intake bushing, was longer than necessary. I contact CBS and they said longer would provide more support and didn’t need to be cut down. However this length would interfere with the breather system. I revealed this to CBS again and they said to switch this bushing out with the exhaust drive side bushing, since it was shorter. Of course the exhaust drive side bushing did not have an oil hole drilled. So CBS said I should drill an oil hole and then debur and ream. I have not checked out if using the much longer bushing on the drive side exhaust cam would interfere with anything else. Has anyone had a similar experience with new cam bushings on this kind of motor?

Also, upon further examination of my cams I found some pitting. On the exhaust is a large pit on the lobe, and a smaller pit on the intake lobe. I’d be interested in knowing if these pits are a serious concern?

Thanks to all!

 

Is this a problem?!

So I finally got all my engine cases clean enough to send to the hydro blaster (perhaps they look good enough without this blasting?) Anyway, when finally getting the head clean I noticed this breach in the right side exhaust portion of the head/chamber. So you can see there is an insert in this space (which the head bold goes through), so I’m not sure if this is OK to use or what. It looks as though this may have been there a long time. Any comments are appreciated.

Also, I live in the Northern Virginia area and am wondering if any members know of someone who could rebuild my head (if it is indeed ok to use). I know of a place in California to send it with a long wait list, and also have someone in Ohio who was given as a reference. I’m wondering who may be more local to me.

Thank you.

 

Thanks for the comment. I imagine that this has been run with it like it is. It does not seem like damage or wear. So it doesn't seem like there would be a safety or longevity issue with the way it is, perhaps a performance issue since it might impact exhaust flow a bit. I'm considering leaving it as it is if this is the case. I've got to think others have seen this exact defect.

 

There is another sleeve in the adjacent exhaust port head bolt hole. But it does not break through the casting.

 

Soon, hopefully, I will be installing my new cam bushings, as well as new bearings in my cases. I suppose this will sound like I am a true novice at this (I am), but can anyone explain camshaft and crankshaft float? I’m most interested in making sure that I understand this before installing and reaming my cam bushings. Thanks for any helpful comments.