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abit off center
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Any guess what happened to my beetle engine?
Rebuilt the engine this spring, here is the link: 72 VW beetle engine rebuild and my daughter has been driving it all summer, its been running great, no problems. She calls me last night and is pulled off the road, she said it revved up real fast and the gas peddle was to the floor and it would not stop. Got to the car and the return spring on the carb broke so it was wide open. I don't know how quick she shut it down but I don't think it was fast enough because when I drove it home it didn't sound that bad just a loud popping like an exhaust leak and a bad miss. All the valve springs are fine (quick check) but now it does not turn over by hand, something is hitting inside? Will pull it today and crack it open. What do you think? broken rod maybe? no oil leaks so nothing went through the case at least! Will post pics tonight! So what do you think I will find inside?
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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10-09-2010, 05:01 AM
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Registered
Join Date: Sep 2002
Location: dfw tx
Posts: 3,957
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I'm guessing it's in the heads, a broken valve perhaps that is stuck into the piston now.
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72 914 2056: 74 9146 2.2: 76 914 2.0 |
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10-09-2010, 05:08 AM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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I too think it's highly likely a valve. Bent or broken and preventing complete rotation.
Can it be rotated back and forth or is it seized? |
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10-09-2010, 05:18 AM
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Join Date: Sep 2009
Location: North of You
Posts: 9,160
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Bent valves. Said the voice of experience.
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10-09-2010, 05:50 AM
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A valve seat may have worked loose.
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Jacksonville. Florida https://www.flickr.com/photos/ury914/ |
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10-09-2010, 06:00 AM
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Double Trouble
Join Date: Nov 2002
Location: North of Pittsburgh
Posts: 11,705
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based on my experience I'd say you will find a valve, upside down that has peened itself onto the wrist pin of the piston.
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10-09-2010, 06:02 AM
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Join Date: Jul 2005
Location: San Jose
Posts: 4,622
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After going back to your rebuild thread and looking at the pictures of the heads... My vote is a dropped valve seat. They didn't look good even then.
I just aquired a 1969 Bug a couple of weeks ago that I am going to go through. Its been a long time since I did one of those too. Going to be fun! Fifteen years under a tarp outside, add a little gas, give it a battery, and it runs.  
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Dan 2002 996 C4 Cab w/ Jake Raby 4.0 2024 Tacoma TRD Offroad 4x4 2003 Range Rover HSE |
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10-09-2010, 07:48 AM
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Burn the fire.
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+1 for dropped valve seat. Check for a bent valve or two as well.
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[x] Working | [_] Broken: 2017 Victory Octane [x] Working | [_] Broken: 2005 Ram 1500 SLT w/5.7L Hemi "Drive it like you stole it." |
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10-09-2010, 07:53 AM
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AutoBahned
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xlnt opportunity to hot rod the motor
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10-09-2010, 12:37 PM
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abit off center
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This was my first set of VW heads that I did but I do pretty good head jobs, at least on Porsche heads. I don't think its a valve, not much time today but pulled the rockers and no bent pushrods and all the valves do work when tapped on. The crank only moves about 5 degrees each way then hits a very solid stop. I think a rod snapped right at the crank! as far as the popping noise that could have been one head leaking at the cylinder seal after it over revved, I had this happen before and it sounds just like it. Should have it all apart tomorrow to see... Really nothing much in the oil screen either, had one little metal flake and nothing around the screen...
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. Last edited by cgarr; 10-09-2010 at 12:53 PM.. |
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10-09-2010, 12:51 PM
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Burn the fire.
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Hmmm... Keyway come lose? Scratch that... I have no clue at this point.
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[x] Working | [_] Broken: 2017 Victory Octane [x] Working | [_] Broken: 2005 Ram 1500 SLT w/5.7L Hemi "Drive it like you stole it." |
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10-09-2010, 01:09 PM
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abit off center
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I know I will have the answer tomorrow but its kind of fun to try and figure it out now! Just pulled the plugs and even with the little bit I can rock the crank with a wire down the hole each piston is moving so the rods are still all there! Hmmmm There is not a lot to these engines, well start unhooking everything underneath....
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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10-09-2010, 02:09 PM
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Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,769
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OK, before you see what really did happen, I want to toss out my guess. Valves are in place and move, so no valve head has popped off. I'm going to say a rod nut is off and jamming the crank.
And, I'm going to say that a valve did hit a piston. Let me know.
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10-09-2010, 03:09 PM
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No fair. You can't change your guess, Milt.
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10-09-2010, 03:12 PM
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Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,769
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I didn't change anything. (a) rod nut is off and (b) the intake valve is bent, but it didn't break. That to me, explains the symptoms and why it froze after being shut down.
I'm sure that's not exactly what has happened. If it is, I can fix the motor over the Internet. 
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10-09-2010, 03:21 PM
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abit off center
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Maybe I should just order this rebuild kit, 3k gets it all!
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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10-09-2010, 04:10 PM
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Registered
Join Date: Jul 2003
Location: Valencia Pa.
Posts: 8,859
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I am going to take a wild guess,and say that it knocked the skirt right off the bottom of one of the pistons , and it is now lodged down in the counterweights.
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No left turn un stoned |
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10-09-2010, 04:25 PM
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Join Date: Jul 2009
Location: Severna Park, MD
Posts: 326
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My guess
I bet you spun a bearing when it overreved. Was loose enough when hot, but siezed whenit cooled down.
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10-09-2010, 05:46 PM
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Champagne on Beer Budget
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bent pushrod?
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10-09-2010, 06:16 PM
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Puny Bird
Join Date: Nov 2002
Location: Port Hope (near Toronto) On, Canada
Posts: 4,566
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Quote:
This is for your daughter right? Stick to no bigger than a 78mm X90.5 and say a engle W-110 cam for longevity and drive-ability. Do some research before you jump in. Also tear into your old engine first to see what the issue is.
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'74 Porsche 914, 3.0/6 '72 Porsche 914, 1.7, wife's summer DD '67 Bug, 2600cc T4,'67 Bus, 2.0 T1 Not putting miles on your car is like not having sex with your girlfriend, so she'll be more desirable to her next boyfriend. |
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10-09-2010, 07:01 PM
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1969 and 1986 Porsche Targa and Coupe 1720cc and 3
1973 Porsche 914 1.7 very modifed
2017 Victory Octane
2005 Dodge Ram 1500 SLT
1987 Porsche 911 Turbo
