PCV / Oil Catch Can Trouble

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ApexArbitrage
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Re: PCV / Oil Catch Can Trouble

Post by ApexArbitrage » Tue May 21, 2019 7:24 pm

Thanks for the encouragement, guys. If I had the time, the tools, and the space to do it myself I would but don't think that's reasonable. I'm hoping my mechanic lets me help out when I can so I can learn as we go through the process, and I'll definitely keep hitting up everyone here for help. This is a great community!
Max | Orange County, CA
insta - @apexarbitrage
1969 SRL311 "Fairlady Sif"
2014 Porsche Cayman S "Fandral"
2011 Porsche Cayenne S "Volstag"

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ApexArbitrage
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Re: PCV / Oil Catch Can Trouble

Post by ApexArbitrage » Wed Jun 12, 2019 2:10 pm

Well, the engine is out and sure enough, the piston rings are broken - or rather shattered:
Image from iOS (6).jpg

The second ring broke on all four cylinders and the top rings broke on #2 and #3, which explains why the compression dropped to 92 on those. The rings that the PO put on there were the Hastings 6829 030 (the pistons are 75mm oversized and the cylinders are 3.463").
Image from iOS (7).jpg

Given that this is what they look like less than 6k miles later I definitely want to replace them with the best quality rings that will last. What would you all suggest as the best option? Thanks!
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Max | Orange County, CA
insta - @apexarbitrage
1969 SRL311 "Fairlady Sif"
2014 Porsche Cayman S "Fandral"
2011 Porsche Cayenne S "Volstag"

C.Costine
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Re: PCV / Oil Catch Can Trouble

Post by C.Costine » Wed Jun 12, 2019 5:48 pm

Hastings has been a respected brand for many many years. What does the shop say about the size of the rings vs the bore, the condition of the bores the condition of the grooves? I would be looking at the installation since there is no paper indication that anything other than the re-ringing was done.
located in Chester NH
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nismou20
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Re: PCV / Oil Catch Can Trouble

Post by nismou20 » Wed Jun 12, 2019 6:17 pm

There’s a likelyhood that the PO didn’t check the end gaps when installing the rings. Too little clearances would cause the ends to butt into each other under heat/expansion and crack them. I had good luck with Hastings just recently, they sealed nicely, no smoke and no oil consumption and power went up noticeably as they sealed. That’s a real mess! How could the seller not have known of this? Did he divulge any info to you before the sale? Caveat emptor, I know but that sucks!

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Gregs672000
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Re: PCV / Oil Catch Can Trouble

Post by Gregs672000 » Wed Jun 12, 2019 8:25 pm

I just got done doing the whole "file the ring end gap" dance with my motor, it takes time and patience. I agree, looks like the gaps were too tight or maybe non-Existent! You do need to check the piston to ring side gap to make sure your pistons are ok (probably are), then independently CONFIRM your bore and piston size and order accordingly assuming the bores are ok too and don't need work. I run non stock pistons so I can't suggest rings, but have used Hastings in the past. What's more important is to get the right sizing and installation, then proper break-in. What do the bearings look like?
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Gregs672000
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Re: PCV / Oil Catch Can Trouble

Post by Gregs672000 » Wed Jun 12, 2019 9:28 pm

I just looked closer at the pic, and it looks like the bearings are pretty rough...
Greg Burrows
'67 2000 #588
Tacoma, WA

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ApexArbitrage
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Re: PCV / Oil Catch Can Trouble

Post by ApexArbitrage » Thu Jun 13, 2019 1:20 pm

So the plot thickens...
Everyone here is right, the rings were not the issue per se. The issue is the PO had forklift pistons installed and then used the wrong second ring (2.0mm instead of 2.5mm) on it.
Image from iOS (8).jpg

It's possible these pistons were used to reduce the compression because the cylinder head was already overplaned (it's 4.459"), or because the PO or PPO was just cheap. Penny smart for them, pound foolish for me.

Will take the block to a machine shop to verify that the cylinders are honed right and that the pistons aren't tapered, although I'm leaning towards just using new pistons. We'll also need to polish/grind the crankshaft and then we'll put on the right new bearings. We will make sure the cylinder head isn't warped and maybe do minimal resurfacing on it.

The good news in all this is I'm learning a lot. For example - never buy a 50-year old car without doing a compression and leakdown test even if the seller appears totally trustworthy!
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Max | Orange County, CA
insta - @apexarbitrage
1969 SRL311 "Fairlady Sif"
2014 Porsche Cayman S "Fandral"
2011 Porsche Cayenne S "Volstag"

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ApexArbitrage
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Posts: 25
Joined: Mon Feb 11, 2019 2:57 pm
Location: Orange County
Model: 2000
Year: High Windshield-68-70

Re: PCV / Oil Catch Can Trouble

Post by ApexArbitrage » Thu Jun 13, 2019 3:29 pm

One more interesting thing I just saw, the tops of the cam towers are marked "4" on the outside and "3" on the inside. Is this OK? I'd have thought they'd be numbered 1-5:

IMG_6169.JPG

Edit: Never mind - the numbers are in tiny print between the top two bolts!
9A991D17-3E5F-44E3-B751-E1D4E4A65A07.jpeg
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Max | Orange County, CA
insta - @apexarbitrage
1969 SRL311 "Fairlady Sif"
2014 Porsche Cayman S "Fandral"
2011 Porsche Cayenne S "Volstag"