3.0L Starter Motor

[Zedebee]

You don’t need to replace bolts on the manifold. 1 screw (on the left) and 6 nuts. Tightening torque is 15Nm for all. It is recommended you replace all the seals though.

[chanlon1]

You don’t need to replace bolts on the manifold. 1 screw (on the left) and 6 nuts. Tightening torque is 15Nm for all. It is recommended you replace all the seals though.

You sure? I've the silver top engine in case it's different.
When I look at the manifold I can see 4 bolt heads and 3 nuts. I'm assuming that the bolts will need replacing as they are aluminium.

[Zedebee]

According to newTIS it’s a screw and 6 nuts for the 3.0Si E86, doesn’t differentiate between silver top and black top. The only bolts that need replacing as far as I know are the ones that go into the block (‘cos it’s a magnesium alloy on the N52); manifold is attached to the head.

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[Z4Mariner]

Hi Chalon1 - I have a 'Silver Top' N52 as well. Our valve cover (VC) bolts are aluminum because the VC is magnesium. The head is aluminum alloy, unlike the aluminum-magnesium block, and AFIK the intake manifold hardware is steel and can be reused. I'm preparing to do this job myself in the next month or so.

Almost on topic, I found an interesting technical sales brochure online from Arnold Fastening Systems, manufacturers of aluminum fasteners (AL9). The link is here: https://www.arnold-fastening.com/filead ... ast-EN.pdf

I found it searching for torque specs on AL9 bolts used to secure the serpentine belt tensioner in a 2017 Golf I was working on for my son-in-law. Arnold's brochure gives the M8 AL9 bolts a torque spec target of 11.7 Nm. Their data show that AL9 fasteners give more stable clamping forces than steel fasteners when joining alloy parts under thermal cycling. Interestingly, they even claim their aluminum fasteners can give good results in removal and reassembly - of course, you would have to be sure the previous mechanic hadn't over-torqued and ruined the fastener . . .

[chanlon1]

Hi Chalon1 - I have a 'Silver Top' N52 as well. Our valve cover (VC) bolts are aluminum because the VC is magnesium. The head is aluminum alloy, unlike the aluminum-magnesium block, and AFIK the intake manifold hardware is steel and can be reused. I'm preparing to do this job myself in the next month or so.

Almost on topic, I found an interesting technical sales brochure online from Arnold Fastening Systems, manufacturers of aluminum fasteners (AL9). The link is here: https://www.arnold-fastening.com/filead ... ast-EN.pdf

Thanks.
Extremely geeky Sunday morning reading