Here goes...1st Engine Drop

[DaddyGlenn]

Thanks guys. I thought it might be from an overfill. I have been known to do that from time to time. I soaked a rag in mineral spirits and was able to wipe out most of it. Since the CIS is still off the engine, I will disassemble it a bit more and use a spray cleaner to get the rest.

I am replacing the breather hoses so if there was a blockage that should take care of it.

Thanks again.

[dweymer]

Wal-mart has the best & cheapest carb cleaner spray BTW, $.97 a can

[DaddyGlenn]

Thanks Donnie but... Wal-Mart is the devil

[VFR750]

Originally posted by DaddyGlenn
Earlier today, I adjusted the valves. Most did not need any adjustments those that did, didn't need much. Of course, there is bad news. I found some pitting on the #3 exhaust cam lobe. Here is a picture. Anyone know how bad off I am? I wont fix it now but I imagine there is a new cam or a regrind in my future. The big question is when?

DaddyGlenn,

Did you get an expert opinion on the cam galling/pitting?

I'm not an engine expert, but I think any visible breakdown of the cam surface is reason to be very concerned. The oil film keeps the rocker from wearing the surface Once the surface is damaged, the rate of deterioration increases significantly because the oil film is disrupted by the roughness.

You may not have to deal with it right away, but how long do you want to wait? 2000 miles? 10000 miles? I think you got lucky and found it before it got really bad.

Just a concerned SC owner.......

[DaddyGlenn]

Thanks Mike. I understand the concern. My guess is that the damage will progress at a geometric rate.

I'd like to get another 10K miles on it before tearing it apart. But I'll be monitoring it closely. Now that I've dropped the engine once, doing it again, if needed to get a better look at the cams, won't be a big deal.

[dweymer]

I agree with Mike, that is a core cam now. Also in that pic, what is the grungy looking stuff on the cam housing next to the rocker? I looked and do not have any more small washers sorry.

[Scott R]

Originally posted by DaddyGlenn
Thanks Dentist. That was just in the nick of time. I had just broken the nuts loose and decided to take one more look here before going in. I went the silicon method.

Earlier today, I adjusted the valves. Most did not need any adjustments those that did, didn't need much. Of course, there is bad news. I found some pitting on the #3 exhaust cam lobe. Here is a picture. Anyone know how bad off I am? I wont fix it now but I imagine there is a new cam or a regrind in my future. The big question is when?

That CAM is shot, probably the result of a blocked cam oil sprayer, or low pressure in the cam spray bay not lubricating the lobe.

Mine looked just like that and they are at http://www.drcamshafts.com right now. "john" "Camgrinder" on this forum can help you out, your just going to have mis-adjusted valves until you correct this, ask me how I know.

[DaddyGlenn]

Thanks guys. I have been in touch with "Camgrinder" and will be sending him my cams and rockers. Just not yet.

I consider myself warned.

[TERRIBLEHONDO]

Glenn sorry to see that cam. When do you intend to get it done? Are you going to get it ground stock or to 964 specs. What kind of quote for rockers and cam. I put my engine back in this weekend. No problems my son ran out on me so I did it myself. I just have to tighten the cv's before I can drive it again.

[DaddyGlenn]

I'm going to see if I can get another 10k miles out of it. I'm looking at around $650 to regrind both cams to 964 spec and rebuild all the rockers. I imagine there will be another couple hundred for chain ramps, gaskets, nuts and bolts etc. I'll budget a grand. At the rate I put miles on the car, I think August 2007 will see that project.

Good job on getting the engine in on your own. I've still got to clean the CIS, install the flywheel and clutch, install the clutch release stuff, rebuild the CVs, clean and paint the engine bay and install the sound pad.

I keep losing weekends to holidays and cub scouts. boo hoo.

[Scott R]

Originally posted by DaddyGlenn
I'm going to see if I can get another 10k miles out of it. I'm looking at around $650 to regrind both cams to 964 spec and rebuild all the rockers. I imagine there will be another couple hundred for chain ramps, gaskets, nuts and bolts etc. I'll budget a grand. At the rate I put miles on the car, I think August 2007 will see that project.

Good job on getting the engine in on your own. I've still got to clean the CIS, install the flywheel and clutch, install the clutch release stuff, rebuild the CVs, clean and paint the engine bay and install the sound pad.

I keep losing weekends to holidays and cub scouts. boo hoo.

That's around what I paid just today, turnaround is quick with drcamshafts, I'll post pics of the rebuilt rockers and 964 spec cams when I get them.

Of course I'm still a million miles away from done, but it gets closer every week.

[TERRIBLEHONDO]

Glenn is there any concern over any extra damage? Or will the lobe just round off? Will you have to baby it? I know I am new to my porsche but I cannot help twisting mine to 6,000 rpm. I do not think I could make mine last 10,000 but mines not a daily.

[Scott R]

Originally posted by TERRIBLEHONDO
Glenn is there any concern over any extra damage? Or will the lobe just round off? Will you have to baby it? I know I am new to my porsche but I cannot help twisting mine to 6,000 rpm. I do not think I could make mine last 10,000 but mines not a daily.

With mine, which were more damaged then Glen's I could never get the valve to adjust up. It was always off, and made for a terrible dead cylinder condition.

I can also you tell you that the damage was continuing on after I discovered it. My damage went from pitting to something that resembled worm wood after about 1000 miles. It's important to note that this condition seems to arise form improper oiling from the spray bar. So it never gets better until the spray bar is cleaned or replaced.

I had a much all over the inside of the spray when I removed it, and no amount of oil changes was going to correct that, they were just plugged and oiling incorrectly. Hence the cam lobe wear and associated rocker issues I had. I was right where Glen was at and I should have stopped and tore the entire thing down. Lack of oiling caused me all sorts of other expensive issues in the end leading to a complete rebuild, and cam tower replacement.

[dweymer]

Glenn I think I have a set of 2.7 core cams if you want to send them out so there is less down time.

[DaddyGlenn]

I tend to drive it pretty hard i.e full throttle and 6,000+ rpm on a regular basis. 10,000 miles ago when I did my first valve adjustment, I found every one to be tight. This time, only a couple were off.

I think I'll run it for 3,000 miles then drop the engine again and inspect the cams. I should be able to drop the engine, inspect the cams and get the engine back in the car without eating up more than one Saturday.

Camgrinder indicated that this is pretty typical for high mileage engines. Although mine only has about 70-85 thousand miles since a rebuild (by a PO) the records don't show any indication that the cams received any service at rebuild time. So, it is very likely that the cams and rockers have over 140 thousand miles on them.

[DaddyGlenn]

Thanks Donnie. Its not so much the down time as the expense right now. This little "while I'm in there" project has gone way over budget already.

[dweymer]

has a way of doing that. I was going to paint the front trunk, and ended up with a two year rebuild.

[TERRIBLEHONDO]

I am back up and running had it out tonight. I agree with you on the engine drop. It is not a big deal at all just set aside a weekend and have the parts on hand. But every time I turn around I see something else I should fix. I need to get a drop link for my sway bar the bushing in it is shot. My air boot on the top of the cis has a bunch of spider cracks also. But I want to drive and fix it here and there as I go so I do not have to outlay all the cash at once. Thats what I like to here 6,000 rpm no sense in having one if you do not turn it. Good Luck

[DaddyGlenn]

Yeee Haaaw!! That's got to be a good feeling, Terrible.

[DaddyGlenn]

Need some more help. I am trying to get the clutch helper spring of the release lever. Here is what it looks like now:


Any ideas how to separate them ... without bending or breaking anything?