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EF Rocker Assembly not machined? 

 

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 Post subject: EF Rocker Assembly not machined?
Posted: Fri Oct 13, 2017 10:04 am 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

This is probably a stupid question.

I've swapped the cam in my EF head. I don't usually turn the rocker assembly over, but leave it upright so the bolts don't fall out. This time, I turned it over and was surprised to find that the top half of the cam "bearing" surfaces are not machined at all - but left rough cast. Clearly, the camshaft doesn't touch these surfaces, or it would be stuffed the first time you turned the engine over. So, what is holding the camshaft to the head?

The only conclusion I can come to is that the valve spring pressing up on the rocker arm pushes the roller end of the rocker arm down on the cam. I guess twelve valve springs provide enough pressure to prevent the cam from going anywhere. Is this right?

Thanks.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: EF Rocker Assembly not machined?
Posted: Fri Oct 13, 2017 1:49 pm 
Getting Side Ways
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Age: 54

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Joined: 12th Aug 2007

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Ride: AU2 XR8 ute & 91 EA bitsa

Location: Melbourne
VIC, Australia

efxr6wagon wrote:
This is probably a stupid question.

No, not really. It's the best way to transfer knowledge.... :D

efxr6wagon wrote:
I guess twelve valve springs provide enough pressure to prevent the cam from going anywhere. Is this right?

Yes, plus the cam chain and weight of the cam as well.

 

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AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection

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