Broken Valve Spring

Ressort de soupape cassé 5!

Ce qui a été signalé comme un problème potentiel avec ce moteur. Désolé que ça vous soit arrivé. Et maintenant ?

Engine is out.
Super Tech Valve Springs
New Valve Stem Seals
Another Set of RBs
Clean Exhaust Ports (SAI)
FRESH SET OF MAIN BEARINGS!

Basically an engine refresh!

Would you mind documenting the timing process on video? All the stuff I’ve seen so far is in German or poorly shot. I’ve got ISTA but I learn much better visually.

So it looks like the spring didn’t drop the valve enough to grenade anything. Got that going for you 👍

I assume the SAP system will get cleaned out too yeah? It’d be a shame to freshen everything else up without going through it.

spammysammich wrote

So it looks like the spring didn’t drop the valve enough to grenade anything. Got that going for you 👍

Yes. Thank goodness it didn’t drop. That would have been game over.
I have a feeling the valve is bent because I can see it hung open. I’m going to replace the spring and seal and do a leak down test. If it leaks too much, I will pull the heads and refresh all the valves.

charliev68 wrote

Yes. Thank goodness it didn’t drop. That would have been game over.
I have a feeling the valve is bent because I can see it hung open

Looks like you dodged a bullet. Yeah hopefully the damage is minimal. I’m sure she’ll be mint when you’re done.

I’ve always been curious about doing springs without pulling the engine entirely. I’ve seen a few videos on swapping springs and refreshing valve seals on N62s. Nothing on our cars though. Maybe I haven’t looked in the right places.

spammysammich wrote

I assume the SAP system will get cleaned out too yeah? It’d be a shame to freshen everything else up without going through it.

I think that’s what he meant when he said this….”Clean Exhaust Ports (SAI)”. SAI:Secondary Air Injection. I just did this with the engine in and it was a suuuuuuper fun job!

Scrippy wrote

I think that’s what he meant when he said this….”Clean Exhaust Ports (SAI)”. I just did this with the engine in and it was a suuuuuuper fun job!

Aaah yes I see, it looks like a fresh hell if the engine isn’t pulled. Yikes.

spammysammich wrote

Aaah yes I see, it looks like a fresh hell if the engine isn’t pulled. Yikes.

In my case I didn’t have the 3g’s to have the dealer do it. A few vacuum fittings on some hose, 1 can of Seafoam per side and a gun bore cleaner worked out for me! The clogged side was evident when I pushed my endoscope through to look prior to any cleaning.

Everything is easy with the engine out!

Gratuitous Plug for MPorium VANOS Cups! FTMFW! Beautiful hardware.

The broken spring put a groove into the bore. Wondering if it will be a problem?
The bucket won’t go pass the groove!

Coming along nicely! Everything looks real good besides the #5 spring

What codes were you getting from the broken spring? This is nightmare fuel for me.

It would go into limp mode and then die. Only codes I got were misfire codes. The whole bank 2 (cyl 5,6,7,8)
I would describe it as a huge vacuum leak. At first that’s what I thought it was. No big deal…lol!

Crankshaft is coming out soon. Curious to see the condition of the Main Bearings. Engine has 130k miles. Will post pics!

Were you able to put the engine back together yet? Any issues with the groove caused by the broken spring?

Theodore2 wrote

Were you able to put the engine back together yet? Any issues with the groove caused by the broken spring?

Working on the bottom end right now.
The groove shouldn’t be a problem according to the people I’ve been talking to. They said just to hit it smooth with a bit, then polish it smooth.

charliev68 wrote

Everything is easy with the engine out!

This looks fucking terrifying to me!

Scrippy wrote

This looks fuckingbterrifying to me!

It’s not that bad. It’s a great engine design, very Motorsport! Design DNA and simplicity of engineering is amazing.