dead motor
Drifting
Joined: Oct 2011
Posts: 3,217
Likes: 14
From: Texas
The water pump that I replaced LAST year is now sans the impeller blades(?!
Was the water pump OE or an aftermarket brand?
Would you please post the details on the water pump you bought? I think many here would like to know the brand.
Rennlist Member
Joined: Feb 2010
Posts: 3,454
Likes: 177
From: So.CA
99 996 with 109k. Engine died at idle, wouldn't start again. Turns over such that the motor is having valve interference issues. No oil under the car at all.
Oil pressure at idle was running fairly low, with the dreaded white smoke cloud at high rpm.
My conclusion: timing chain tensioner dropped, allowing one chain to skip a tooth. Since this is a fairly high milage motor, with low oil pressure, I'm going to overhaul it.
My question: As an aircraft mechanic, I think that the in house overhaul would be the best, most cost effective way. Since I've not overhauled one of these before, any suggestions? I'm looking for a good source of the parts, services, and materials needed. Also, any recommendations for a rebuilder in the SE US? (Just in case)....
Thanks
Oil pressure at idle was running fairly low, with the dreaded white smoke cloud at high rpm.
My conclusion: timing chain tensioner dropped, allowing one chain to skip a tooth. Since this is a fairly high milage motor, with low oil pressure, I'm going to overhaul it.
My question: As an aircraft mechanic, I think that the in house overhaul would be the best, most cost effective way. Since I've not overhauled one of these before, any suggestions? I'm looking for a good source of the parts, services, and materials needed. Also, any recommendations for a rebuilder in the SE US? (Just in case)....
Thanks
Thread Starter
Instructor
Joined: Dec 2012
Posts: 149
Likes: 1
From: brandon, ms
Update: Just a few pictures showing the particular failure modes on this engine. I didn't bother with the rest of the pictures showing the removal and dismantling: who needs that after the great job the Logray did with his?
The most disturbing (annoying) is the $350.00 water pump that lasted around 18 months or so. I couldn't tell you where I bought the waterpump from: I believe it was from Pelican Parts, IIRC. The damage pattern looks like one vane gave away and took out the others. A serious system flush is in order here.
I also show the 1-3 intake cam where it broke.
The third picture shows how I held the variocam actuators closed using 0.032" safetywire.
On a side note: While I could have raised the rear of the car higher to clear the motor, I instead opted to remove the MAF and intake risers. This allowed me to keep the car on the jackstands without having to add wood blocks to the jack in order to get it high enough.
All of the bearing surfaces, crankshaft, camshafts (except the broken one), etc. are in very good condition. I'm now waiting for the heads, crank and rods to come back from the shops so I can proceed on to the next phase.
The most disturbing (annoying) is the $350.00 water pump that lasted around 18 months or so. I couldn't tell you where I bought the waterpump from: I believe it was from Pelican Parts, IIRC. The damage pattern looks like one vane gave away and took out the others. A serious system flush is in order here.
I also show the 1-3 intake cam where it broke.
The third picture shows how I held the variocam actuators closed using 0.032" safetywire.
On a side note: While I could have raised the rear of the car higher to clear the motor, I instead opted to remove the MAF and intake risers. This allowed me to keep the car on the jackstands without having to add wood blocks to the jack in order to get it high enough.
All of the bearing surfaces, crankshaft, camshafts (except the broken one), etc. are in very good condition. I'm now waiting for the heads, crank and rods to come back from the shops so I can proceed on to the next phase.
Banned
Joined: Mar 2010
Posts: 7,697
Likes: 31
From: Chicago
I wonder if there was previous work with lifter replacement or anything of that sort?
Rennlist Member
Joined: Feb 2010
Posts: 3,454
Likes: 177
From: So.CA
The last time I had a snapped camshaft was in a BMW I bought used when a previous owner or some one that worked on the car forgot to torque the cam holders to spec. One got loose and vibrating a few others loose. However this happened on Hollow camshaft. Until then, I never seen a backfire happen on the intake side(as oppose to the exhaust muffler) before.
I wonder if there was previous work with lifter replacement or anything of that sort?
I wonder if there was previous work with lifter replacement or anything of that sort?
Thread Starter
Instructor
Joined: Dec 2012
Posts: 149
Likes: 1
From: brandon, ms
In re: the questions about the broken cam:
the saddle brackets seemed to be torqued the same as the rest of the mounts, so no problem there. I looked at the break to see if a crack might have been preexisting, and propagated through the cam. Nothing as seen through a magnifier. As I recall, this cam was solid, but I'll check when I get back. There was no heat discoloration anywhere indicating an overheat condition. I'm going to have the cams magnafluxed anyway, just in case.
the saddle brackets seemed to be torqued the same as the rest of the mounts, so no problem there. I looked at the break to see if a crack might have been preexisting, and propagated through the cam. Nothing as seen through a magnifier. As I recall, this cam was solid, but I'll check when I get back. There was no heat discoloration anywhere indicating an overheat condition. I'm going to have the cams magnafluxed anyway, just in case.
Former Vendor
Joined: Nov 2010
Posts: 6,968
Likes: 2,341
From: Cleveland Georgia