BrianF

Apparently, my scavenge pump failed, causing significant engine damage. A rebuild is being recommended between $9,250 to $14,000. The car has 40k miles. Anyone have this happen and the repair? Any thoughts. advice? Invest in the car? Everything else works great.

yelcab

What was the damage? Bottom end only or top end as well?

BrianF

Not sure? They found metal filings in the oil and think it is only one shaft that is damaged. However, they need to take the engine apart to determine full extent of the damage.

NYoutftr

How could this have been diagnonsed before failure.
What was the time span from first found out to failure?

Porschetech3

I have seen several scavenge pumps fail. Everyone I have seen fail was actually "collateral damage" from a failed timing chain roller.

The timing chain lost a piece of one of the rollers and it got sucked up by the scavenge pump. Scavenge pump internal clearance is tight and any piece larger than a pin head will cause damage to it or lock it up.

From there the damage can be minor or catastrophic. Sometimes the pump locks and just breaks the drive snout. Sometimes it beaks the exhaust cam gear. Sometimes it breaks the timing chain and valves start hitting the pistons, so the extent of more collateral damage can vary greatly !!

Prelude Guy

I have an engine that suffered a SP failure. I took off the heads. Fortunately no valve or piston damage. The damage I did notice was a broken cam gear, timing/cam chains, chain guides, and random metal in the oil pan from the broken SP gear that fits into the cam gear.

I was hoping it is fixable but it really is best to rebuild the engine. I reached out to FSI and they recommended a rebuild still.

Porschetech3

How many miles on that engine? Sounds like its fixable to me, but , yea, it's always good advice to do a complete rebuild. You can always pretty much justify a complete rebuild.

Prelude Guy

BrianF,

I sent you a PM.

2002 3.6 L with 107K miles.

Here are some more details on the failure: https://rennlist.com/forums/996-foru...e-not-mad.html

If you think you can fix it, PM me. I can send you the pics I have.

Silk

Here also some experience with failing scavenge pump at around 115.000 miles.

It was the scavenge pump on bank 1 which started deteriorating slowly.

Symptoms were that over time more and more oil was being spitted out via the AOS vent line. This occurred especially when making right hand turns. The oil would pile up in the head due the lateral g-force and the lack of pumping capacity there would cause too much oil staying in the head and flooding the AOS. The extra pressure in the crankcase was enough to push out enough oil. At the end almost 175ml of oil came out just taking one long 180° right hand turn on a highway ramp at moderate speeds 35-45mph. I had my AOS line rerouted so luckily the oil did not end up in the intake. So It saved me from a catastrophic hydro lock.

No real damage to be visible noted on the scavenger pump itself, some scuffs and light scars on the side surfaces of the gear. Only testing it for pumping capacity would show it had a much lower capacity. Further no collateral damage to be seen on other at first sight. Exchanged it for a new one and it solved the problem.

Zookie

dont bother with Rebuild unless you plan to go full out like 3.8 or 4.0 with Forged Internals and IMS Solution.
You can get a New Shortblock for Porsche now for 7k and be on your way

NuttyProfessor

Is it me or does it seem like a lot C4S 992 cars are dropping like flies these days?

OP, sorry to hear about the damage. I agree with Zookie. But I wouldn't put another M96 shortblocks. I would pay Flat 6 to reconstruct the engine.

Imo000

At 3 times the cost.

BrianF

Thanks. This has all been very helpful.

Zookie

yup i just did mine (18 months in the build) picking it up this weekend
looking at the final bill vs a new shortblock
i would never build it again, id do the short block and call it a day

808Bill

I agree with others, what ever cost you think it will be double/triple it...Tools alone are going to set you back just to get started.
Again, sorry you have to deal with it like this...