Tomei Poncam 'b' Install In Rb26- Exhaust Cam Does Not Rotate

[T04GTR]

fark sounds like some dodgy ass shops out there,

[STRETCH]

the cams we fitted were secondhand. we thought that the exhaust cam may have been bent .

The cam broke behind no.3 valve. cam not hitting anything in head clearances ok. buckets removed still no turn. the new cam we installed had exactly the same problem. this did not snap this one. they are 260 by 9.15 lift. .

All the caps had no markings on them which is strange but were put back in the same order they came from.

we ran striaght edge across the tunnel and there are variations in clearance .

strange thing was the original cam when put back in was tight as well. clearanced the caps to allow to turn freely but this shouldnt have to be done.

andrew the cam is in the box with the other one.

the second

Edited February 6, 2007 by STRETCH

[Andrw Le Lievre]

Greg,

Thanks for jumping in and clarifying some of the Qs. Shows integrity to do so.

Andrew

[Beer Baron]

well this puts a new spin on things. Greg in my experience knows his stuff when it comes to RB26 so a simple thing like cam install would not be a problem for him. so it sounds like there may be more going on here either with the head, or the cams.

and since his business hadn't been named here in this thread at all he showed a lot of guts to post up here and explain what was going on. good work.

[STRETCH]

thats 1 beer i owe the baron

[rev210]

using new bolts?

[STRETCH]

no original bolts were refitted

[Fitzpatrick Speed Works]

Rb26 cams are just tricky little bastards, i have seen them snap undoing the cam caps, the thrust bearing is a real problem as are the studded caps which 1 in every ten the stud will bind up and its almost an hours work to fix that problem alone.

Good luck with the problem i would say your just having a bad run, good old Murphy is paying you a visit.

[CruiseLiner]

ive snapped a jun one installing it, though we had it in and out about 10-15 times atleast so that didnt help. as said above u gotta tighten it down evenly front to back or u will bend it and snap i got some longer bolts to tighten them down as i had hd springs and kept stripping the threads in the head as the stock length bolts only go in 2 turns or so before they tighten up and going into ally = weak metal. once they are down enough i replace the longer bolts with the stock ones and have had no issues since (these cams have been in and out around 30 times now), its got to be the worst and most dreaded job on the 26 i can think of. worst thing is with my jun cams i need to take them out to get to the jun head studs

[rev210]

it seems it goes easy or it doesn't. When I did the Tomei cams in mine I was so impressed at how easy it was compared to the push rod setups I'd done in the past. I did double the number of steps in torquing the bolts off and on that nissan had in the manual, as I initially didn't have access to the manual at the time and used my intuition (usually a bad move).

[Beer Baron]

thats 1 beer i owe the baron

haha, you don't owe me any beer. but on the other hand I'm not going to turn it away either. Next time I'm a little down after you blow past me on the straight at EC please provide 1 beer after the last session.