Cam tower bolts

[edekalil]

Before I go any further, Got the cam towers seated on head and cam in lubed up with oil and the cam can be turned by hand, it feels snug. Now for the tower bolts, should they get some anti seaz or oil before inserting and torking. Any suggestions on how to tork the cams towers. The book says 25-33 ft pounds. Soon as I get past this part the head will go on the motor and any suggestions on torking it is welcomed then the rest of the parts put on and all get lined up and pull the timing gear and install it back on with the chain and hopefully off to the races.

 

 

Please forgive the mess on my guitar fixing bench, the head and it's parth are all safe and clean.

Edited November 23, 2020 by edekalil

[banzai510(hainz)]

cam tower bolts are like 10-13pounds if that and they strip out EZ BE CAREFULL. You sure that isn't inch pounds  not foot pounds????????????

 

Im going by memory but Im sure it isn't 30 ft pounds

[edekalil]

27 minutes ago, banzai510(hainz) said:

cam tower bolts are like 10-13pounds if that and they strip out EZ BE CAREFULL. You sure that isn't inch pounds  not foot pounds????????????

 

Im going by memory but Im sure it isn't 30 ft pounds

Gotcha

[edekalil]

Here is the info from how to rebuild your nissan Datsun ohc engine

 

I didn't see about putting anything on the threads when installing. I guess the 25-33ft-lb might not be right well see. I sure don't want to mess up at this point.

Edited November 23, 2020 by edekalil

[edekalil]

Well I read on a forum somewhere around 05 people talking about what your saying about 10-13 lb I think they where saying go no more than 15 lb but I for sure do not want to screw it up. 

[datzenmike]

Check the cam turns only after tightening it down. I'd go on the low side 10-12. It's not going anywhere with a head bolt through each tower.

[edekalil]

Will do how about the bolt threads no oil or anti seize?

[datzenmike]

I guess anti seize wouldn't hurt.

 

In the future try to avoid ever taking the towers off the head.

[edekalil]

The last head I had a valve fixed the people didn't, I didn't know this fella was going to take them off so from know on I know to tell them not to take them off. So tomorrow the journey begins. Let's see how far I get and thanks again for the experienced know how I can use it.

Edited November 24, 2020 by edekalil

[datzenmike]

If the head were to be planed you might have to.

[edekalil]

I'll post a pic of the cam tower he broke, not sure how he did it. I would have preferred he left them on and not mess with them but too late now. Y'all cross your fingers for me.

[iceman510]

I have success with aligning the towers using a rubber mallet and the technique mentioned in the snippet posted above.

[banzai510(hainz)]

I just put the cam in there then lightly torq to spec gping inside out like doing a head

 

see if cam turns  (lube of coarse) BAM YOUR DONE

[edekalil]

Got the cam towers done as suggested and the cam turns not being as strong I have to grip it with Tow hands to rotates all the way around. So I guess next now that all is cleaned up on the block is to get the head installed. I see 40 ft lbs as max torque. Any suggestions. I know the order to torque the head bolts 

[datzenmike]

L16/18 are 43 but you can torque to 60 on an L20B and they are basically the same head with the same head bolts.

[edekalil]

I thought way back I saw something about 60 ft- lbs but I do see 40 ft- lbs in the how to rebuild you ohc engine book, so what would you suggest for final ft-lbs

[datzenmike]

Follow the book. Maybe it came into print before the L20B when 43 was the norm. The first L20B was the '74 610 so it may have taken a couple of years for this to be common knowledge. 

[edekalil]

Cool I'm going down stairs and putting it on, thanks again.

[Duncan]

The "How to rebuild your Datsun OHC engine" book lists the head bolt torque on an L20b at 61 ft/lbs.  I did mine at 60 lbs. and didn't worry about the 1 lb discrepancy too much.. 

 

 

 

 

[datzenmike]

So many variables. The largest is how accurate is your torque wrench, how accurate is the device that tests the torque wrench? Temperature. Dry or oil on threads.

[420n620]

I've used 3 in 1 oil to avoid hydro locking bolt holes when I rebuilt engines. It's thin enough to allow air to escape and gives the threads enough lube to cut down

the friction on the threads so you get the proper torque needed , just a couple of drops is good. Just make sure all threads are chased and clean of debris / dirt.  

 

[KELMO]

Geez, and I thought the can of 3 in one I had was old

[datzenmike]

Its 20w weight oil. I just clean the threads with an oily rag.

[KELMO]

The last "A" motor I took apart had a fair amount of crud on the bolts so I chased the threads and holes to clean them up. On the head bolts, I cut a groove in the end and put axle grease on it to help drive debris out of the hole (may have even picked this up from you DM, but not really sure) then clean out with brake cleaner.