dropping valves?

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ruckman101
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dropping valves?

Post by ruckman101 » Sat Jun 13, 2015 4:13 pm

So the valve gap adjusting screws should all be at relatively the same place, right? And the height of the valve stems those adjusting screws gap to should all be at the same height. right? Mine aren't. The valves on cylinder/pistons two and four seem to be taller compared to the valves on cylinder/pistons one and three. I am concerned. Especially since the same guy who didn't fix my transmission reconditioned my heads, and since the exhaust gap dropped on cylinder/pistons two and four after adjusting them and running the engine only long enough to check the timing, and I didn't like the sound of it.

Sheesh, and I was hoping to get to Maupin next weekend.


neal
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Re: dropping valves?

Post by Jivermo » Sat Jun 13, 2015 4:38 pm

We live in a new world of mechanics who aren't.

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ruckman101
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Re: dropping valves?

Post by ruckman101 » Sat Jun 13, 2015 4:48 pm

Sounds rattly.

neal
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hambone
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Re: dropping valves?

Post by hambone » Sat Jun 13, 2015 8:59 pm

Compression test yo yo sucka.
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ruckman101
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Re: dropping valves?

Post by ruckman101 » Sat Jun 13, 2015 10:34 pm

Will that tell me if the valves are stretching, or are the seats are receding.

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hambone
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Re: dropping valves?

Post by hambone » Sat Jun 13, 2015 10:43 pm

Could be the adjusting screws too. If the compression is OK it's probably allright. How much did the gap close? Did you check it cold? You are nervous you know.
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ruckman101
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Re: dropping valves?

Post by ruckman101 » Sat Jun 13, 2015 11:01 pm

When I initially adjusted the valves, stone cold. After getting the new ignition switch in, backing out of the garage 60 feet to a shady spot so I could see the flash of a timing light, which needed no adjustment, hadn't drifted, and then pulling back into the garage, the exhaust valves especially had tightened a smidge more than I had just adjusted them, after letting things cool off say an hour and a half. No test drive, just idling until the choke had quit on the carb. Everything was cold to the touch, and laying a flat-edge across the top of the valve stems with rockers off, not level.

At this point, looks like I'll be throwing Gretchen's engine in until I have time to figure it out. Our loaner Miata will be reclaimed soon. Have to be at least a one vehicle household.

neal
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ruckman101
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Re: dropping valves?

Post by ruckman101 » Sun Jun 14, 2015 5:46 pm

So Maybe no swap. No ring on the pressure plate of Gretchen's engine, just bare fingers. Is it critical the pressure plate have a ring in the center?


neal
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tristessa
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Re: dropping valves?

Post by tristessa » Sun Jun 14, 2015 7:18 pm

ruckman101 wrote:So Maybe no swap. No ring on the pressure plate of Gretchen's engine, just bare fingers. Is it critical the pressure plate have a ring in the center?
Yes.

Swap the pressure plates.
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ruckman101
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Re: dropping valves?

Post by ruckman101 » Sun Jun 14, 2015 8:24 pm

Can't swap the pressure plates. Gretchen's has been balanced to the drive train and the flywheel has a post added that goes through a hole in the pressure plate to align and reference the balance job.

neal
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Re: dropping valves?

Post by Bleyseng » Mon Jun 15, 2015 9:19 am

That's never stopped me, drill a hole is the other PP and install. Maupin, you can't miss Maupin and I'll be there for once.
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ruckman101
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Re: dropping valves?

Post by ruckman101 » Mon Jun 15, 2015 5:14 pm

Balance. I do have spare valves in other used heads.


neal
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hambone
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Re: dropping valves?

Post by hambone » Tue Jun 16, 2015 7:09 pm

Neal is this singleport?
If so, I have a shop-inspected good head, although it is disassembled. It is clean and ready to put back together, good valves the werks.
It is yours, maybe trade me for a distributor? Although I think I'm going with the Pertronix SVDA.
Maybe you can make the lakey camp if you get your shit back together. Funny, I gave Randy a 2.0 head and he did the same damned thing last year.
If you are dual port you ar out o luck my fren.
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ruckman101
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Re: dropping valves?

Post by ruckman101 » Tue Jun 16, 2015 8:04 pm

Only one? This issue seems to be cropping up on both sides.


neal
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hambone
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Re: dropping valves?

Post by hambone » Tue Jun 16, 2015 8:48 pm

Only one he says.
What are the odds of both heads being bad? I guess it's possible, but not likely they'd fail in the same manner...
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it balances on your head just like a mattress balances on a bottle of wine
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