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Search: Posts Made By: Tom928
Showing results 1 to 25 of 487
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Forum: 928 Forum
12-28-2017, 01:30 AM
Replies: 49
Views: 5,529
Posted By Tom928

Yes. With the new head gasket torqued to spec, I...

Yes. With the new head gasket torqued to spec, I get 8-10 sec's leak times across cylinders 1-4. Cylinder #4 was on the high side 9, 10 & 10.
It was satisfying to see the gauge show pressure on...
Forum: 928 Forum
12-27-2017, 12:28 PM
Replies: 49
Views: 5,529
Posted By Tom928

Break-in?

Engine is reassembled, back in the car and I am reconnecting everything. I've been thinking about any break-in?
Maybe do some hills aggressively or just drive it?
Forum: 928 Forum
12-25-2017, 10:16 PM
Replies: 17
Views: 1,304
Posted By Tom928

Merry Christmas to all members. Thanks to...

Merry Christmas to all members. Thanks to everyone for all the help and encouragement. I would not have been as successful with my 928 without the support of this community.
Live long and prosper to...
Forum: 928 Forum
12-20-2017, 05:31 PM
Replies: 49
Views: 5,529
Posted By Tom928

After the second screw up, I got a recommendation...

After the second screw up, I got a recommendation for a local shop familiar with 928. It's about 30 miles further to drive.
When I explained what had happened the guy knew what was wrong even before...
Forum: 928 Forum
12-20-2017, 02:42 PM
Replies: 49
Views: 5,529
Posted By Tom928

Hi Mark, Thanks for the offer but I already...

Hi Mark,
Thanks for the offer but I already took the 4.7L head and an old 4.5L head to the shop to have them swap the valve.
Forum: 928 Forum
12-20-2017, 01:54 PM
Replies: 49
Views: 5,529
Posted By Tom928

I was thinking about that and could not find the...

I was thinking about that and could not find the spring compressor, so this morning I took the heads to the shop.
In a day or so I should be able to start putting it back together.
Forum: 928 Forum
12-19-2017, 11:04 PM
Replies: 49
Views: 5,529
Posted By Tom928

PET shows 928.105.417.03 for both. Roger checked...

PET shows 928.105.417.03 for both. Roger checked it this morning when I called about a new valve.
New valve seals put in when the heads were done. I should be able to just swap the valves.
I'll...
Forum: 928 Forum
12-19-2017, 01:49 PM
Replies: 49
Views: 5,529
Posted By Tom928

Hi Stan - Yes I don't think the shop did that...

Hi Stan - Yes I don't think the shop did that right. I find that new valves are quite expensive.
I have a set of 4.5L heads and I see that the exhaust valve is the same and well as the seat.
I...
Forum: 928 Forum
12-19-2017, 02:48 AM
Replies: 49
Views: 5,529
Posted By Tom928

With new rings installed in cylinder #4, leak...

With new rings installed in cylinder #4, leak down now passes with 5-6 sec with the old head gasket.
Ring gaps were 0.48mm and 0.52mm which are out of spec but I understand for Goetze rings this is...
Forum: 928 Forum
12-09-2017, 02:55 PM
Replies: 49
Views: 5,529
Posted By Tom928

I took some photo's of the piston. I do not see...

I took some photo's of the piston. I do not see any damage to the ring lands. Also photo's of the bearing which look good.
Looking at the broken edges of the rings, there appears to be a lot of...
Forum: 928 Forum
12-09-2017, 01:27 AM
Replies: 49
Views: 5,529
Posted By Tom928

I checked the piston, it shows no evidence of any...

I checked the piston, it shows no evidence of any damage on the ring lands or any contact in the valve recesses.
The valve's in the head show no apparent contact. The new machine shop indicated that...
Forum: 928 Forum
12-08-2017, 09:54 PM
Replies: 153
Views: 12,455
Posted By Tom928

Hi Mark, A set or Euro Cams for a 4.7L?

Hi Mark,

A set or Euro Cams for a 4.7L?
Forum: 928 Forum
12-08-2017, 04:59 PM
Replies: 49
Views: 5,529
Posted By Tom928

OK we found the problem. 2 broken rings. So I...

OK we found the problem. 2 broken rings.
So I had bad tip height on the valve that was replaced and we had 2 broken rings all in the same cylinder.
No wonder there was no compression and leakdown...
Forum: 928 Forum
12-08-2017, 03:56 PM
Replies: 49
Views: 5,529
Posted By Tom928

I have a ring compressor but my ring installer is...

I have a ring compressor but my ring installer is gone.
I have the oil pan off, both rod nuts loose. I'm at the bottom of the stroke.

Here is what I've done before...
Tap upward on the rob bolts...
Forum: 928 Forum
12-08-2017, 02:25 PM
Replies: 49
Views: 5,529
Posted By Tom928

Leakdown values: #1 = 4-5 sec #2 = 6-7 sec ...

Leakdown values:
#1 = 4-5 sec
#2 = 6-7 sec
#3 = 5-6 sec
#4 has always been 0 maybe 1 sec.

The scratches are not enough to catch a fingernail on. They look like they are made by broken rings as...
Forum: 928 Forum
12-07-2017, 05:19 PM
Replies: 49
Views: 5,529
Posted By Tom928

After several months of attending to life events,...

After several months of attending to life events, I was finally able to get time to work on this.

Long story short, I removed the engine, pulled the head, took it to a new machine shop.
They...
Forum: 928 Forum
11-20-2017, 11:22 PM
Replies: 2
Views: 1,342
Posted By Tom928

These CIS parts are available again.

These CIS parts are available again.
Forum: 928 Forum
09-10-2016, 12:07 AM
Replies: 49
Views: 5,529
Posted By Tom928

Thanks for the setup pic and the procedure. I...

Thanks for the setup pic and the procedure.
I was wondering if normal blowby could be the towel movement.
I do need to do the test and see.
What kind of compression values did you have with the...
Forum: 928 Forum
09-09-2016, 11:41 PM
Replies: 49
Views: 5,529
Posted By Tom928

This was my reasoning when I took the oil fill...

This was my reasoning when I took the oil fill cap off, removed the basket and put the paper towel over it. If air is getting past the rings into the crankcase then this would be it's path of least...
Forum: 928 Forum
09-09-2016, 11:30 PM
Replies: 49
Views: 5,529
Posted By Tom928

I corrected the origiinal post. It is cylinder #4...

I corrected the origiinal post. It is cylinder #4 last one on the passenger side.
Forum: 928 Forum
09-09-2016, 09:01 PM
Replies: 49
Views: 5,529
Posted By Tom928

This morning when I found this, I knew I was...

This morning when I found this, I knew I was pulling the engine again...
Forum: 928 Forum
09-09-2016, 06:45 PM
Replies: 49
Views: 5,529
Posted By Tom928

1981 new 4.7L low compression after initial miles

Over the last few years, I swapped out a 4.5L with a 4.7L in my 81. Used 4.7 short block, cleaned up, valve job, new gaskets and seals.
Initial startup went fine, first 50 miles were good but with...
Forum: 928 Forum
08-30-2016, 10:23 AM
Replies: 133
Views: 42,669
Posted By Tom928

Thanks Hacker for starting this. Mobil 1...

Thanks Hacker for starting this.

Mobil 1 15w-50 for the 81 and the 84. Because in 2005 when I purchased many Rennlister's recommended it.
The 81 just came back to life with a 4.7L with M1 oil. I...
Forum: 928 Forum
07-21-2016, 06:34 PM
Replies: 20
Views: 5,243
Posted By Tom928

It's ALIVE...Just to let everyone know, the car...

It's ALIVE...Just to let everyone know, the car started up 2 days ago and the wiring harness is working fine. Carl was very helpful and provided great customer service.
Forum: 928 Forum
03-12-2016, 02:28 AM
Replies: 20
Views: 5,243
Posted By Tom928

Hi Carl, I haven't had a chance to reply as...

Hi Carl,

I haven't had a chance to reply as I've been out of town for the last 4 days,
The harness install just started and it will come out easily.
I would prefer to return it and replace with...
Showing results 1 to 25 of 487
 
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