New rocker arm + used head= sharp ridge?

[DexterH]

Hi guys.
Ok so no one has any advice on my timing procedure? Or maybe youre still drafting notes
Well my father-in-law has surprised me today with a full set of new valves, intake and exhaust.
This morning before I left for work he offered to grind/reseat the old ones and replace the seals. I was happy for the help and he was happy to have something to do. After being retired from the garage many years, he was anxious to get his hands on the job again.

Two valve heads were damaged (indentations from the 1/2 round ball on the rocker tip) and considering we are installing a brand new rocker assembly, it made sense to replace the 2 valves.

I got home this evening to find not 2 but all valves replaced and seated. I used his lapping tool (without him noticing) to check seating and as I swiveled each one, they were all perfectly seated, running silent as swiveled back and forth rapidly. He sure took time and patience, and I owe him bigtime!

I cleaned the head thoroughly and decided to see if the new rocker arm would have any problems mounting on the head, particularly where I did the welding. Sure enough there was a minor problem as that bore where the dowel fits needed opening a bit. I used a rat-tail file and opened it just enough for the dowel to get in.

Finally the matter at hand:
Upon assembly of the new rocker arm to the head (without camshaft) I noticed a very sharp ridge where both halves meet. Not sure the correct name for those but it is the actual bearing of the camshaft. My question is, is it ok to assemble the camshaft with that ridge or should I lightly file it and run some fine grit emery paper on it after?
Im not sure if that ridge can cause damage to the cam as it may cut into it. Its only a small fraction of a millimeter but its noticeable as I pass my finger on it.

If I do file it and break the edge, would I compromise the lubrication of the cam?

Hoping for answers.
Thank you.

[Growlerbearnz]

You mean the alloy camshaft bearing caps, right? The four pieces that hold the camshaft down, and the rocker shaft then bolts on top of them? You have to use the original bearing caps that came with your head- you can't replace them with bearing caps off another head.

During head manufacture, the bearing caps are bolted into place and the camshaft bearings are all bored at the same time, in a straight line. There shouldn't be any misalignment at all. The bearing caps should have short tubes (alignment dowels) in them where the bolts go through, those are to keep them aligned. Maybe one of the alignment dowels is missing?

(This also means that you have to put the caps back in their original positions- they should be marked 1-4 though.)

[DexterH]

Thats it, camshaft bearing caps. Im not familiar with alot of part names as the only mechanical experience I get is only when working on my vehicle. Always nice to learn along the way.

Im glad for that tip reusing the original caps though I didnt notice any markings on them. Matter of fact I scrapped the old rocker arm and not sure which cap would be #1,2,3 and 4.

I will double check them when I get home later.

On the 3rd cap (from front of engine) it was the bore closest to the head bolt that got a little damaged while welding , causing a piece to break off. That was the one the dowel couldnt fit but I was able to lightly file the bore and got it in.

Luckily it was only the area where the dowel fits that broke and not where the threads were.

Thanks GrowlerB

[Growlerbearnz]

Righto. Cap 1 (front of engine) is easy because it's a different shape to the others.

Caps 2, 3, and 4 have a number stamped onto their top face.

Cap 5 (back of engine) is not numbered.


Page 11A-7-2 of the workshop manual http://www.delica.ca/forum/viewtopic.php?f=17&t=7335

[DexterH]

I took your advice and used back the original caps. Cleaned them up pretty good, looks like new and I saw the numbers on them.

Im gonna have a very early start tomorrow hoping to be on the road again by Monday. I have only one dissappointment. That upper balance shaft spacer I'm unable to get anywhere. I'm thinking to use it reverse like I did before, only this time I'll chamfer the edge with a file. I dont have much of a choice at this time.

If I had remembered having problems with this spacer when I was rebuilding the block last year, I wouldve taken it to a machine shop and had one made earlier this week.

Other than the spacer, I think I'll be ok.