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Trying to wrap my HEAD around this

flagoworld

By flagoworld
in BMW 2002 and other '02

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flagoworld Mentor

flagoworld

Posted
Posted

First,

There's this divot in my head. It appeared to have been filled with corrosion. I gently picked out the corrosion. Is this salvageable? Can I fill it with anything?

 

Second,

My plan is to rotate the cam as I pull out the rocker shafts such that I can pull the rocker arms off one-by-one. I tapped the shaft out a little bit and noticed the arm doesn't slide in that direction. What's the trick?

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'74 Verona

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Tommy Grand Master

Tommy

Posted
Posted
54 minutes ago, flagoworld said:

Second,

My plan is to rotate the cam as I pull out the rocker shafts such that I can pull the rocker arms off one-by-one. I tapped the shaft out a little bit and noticed the arm doesn't slide in that direction. What's the trick?

 

You haven't removed the circlips of the rocker arms. You need to rotate the cam so that there is lash, then slide the rocker against the spring and remove the clip on the other side.

Racing is Life - everything before and after is just waiting!

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Simeon Grand Master

Simeon

Posted
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The one I haven't tried yet is wedging/ wrapping shop rags around the valves when compressed by the cam so that the valves get left propped open somewhat when you rotate the cam away. Slacken the lash adjusters off and you should be able to wiggle the cam out. 

 

Let it us know how you get on with that (since I haven't done it yet!) if you do decide to have a go. 

rtheriaque wrote:

Carbs: They're necessary and barely controlled fuel leaks that sometimes match the air passing through them.

My build blog:http://www.bmw2002faq.com/blog/163-simeons-blog/

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TobyB Grand Master

TobyB

Posted
Posted

If you clean it up first, it's a lot easier to work on.

 

He says, learning that one from experience.

 

Get a machinist to look at that head before you spend any money on it.

If they recommend a pressure test, do that.

 

Then carry on, carry on...

 

t

 

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Mike Self Grand Master

Mike Self

Posted
Posted

What year is your engine?  I ran out of valve adjustment on some of my '69's rocker arms beginning at 35k miles.  Rockers themselves weren't worn, just the shafts.  It was explained to me that the early rockers were all aluminum (no bushings) and the soft aluminum retained grit that ground away at the shafts.  Finally at 100k I replaced all the arms and shafts with later style arms (I had been using oversize adjusters previously) and all is well at 224k.  

 

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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TobyB Grand Master

TobyB

Posted
Posted

That's why you change your oil, see?

 

Seriously, that's not particularly uncommon in higher mileage lower- maintenance engines.  I think

Mike's explanation is dead- on- even slightly dirty oil is hard on the rocker- to- shaft interface.

And while I wouldn't have made this connection before, the rockers ARE in sliding friction-

maybe the lack of zddp is felt here, too.  Because usually, if the lash pads are ugly,

the rocker shafts are usually murdered, too.

 

I've only saved a few shafts out of a few dozen parts engines...

 

t

 

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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TobyB Grand Master

TobyB

Posted
Posted

Do get that head checked carefully for leaks-  it's showing a lot of corrosion,

and that's bitten me before- as in, we had coolant leaking out

of a head bolt hole...

 

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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