It Was Going So Well, Then Something Broke |
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It Was Going So Well, Then Something Broke |
Mblizzard |
Nov 16 2013, 04:02 PM
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#1
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Well just got my carbs sorted. Went for a drive and something has come unglued in the bottom of the engine. Huge loud slapping like a rod banging. Very rpm related. On the 3 4 side. No damage to the plugs. Still runs but it is clear that something is very broken. Will check valves tomorrow but I am betting the case has to be split.
Any thoughts on easy things to check or where to start? (IMG:style_emoticons/default/headbang.gif) |
914_teener |
Nov 16 2013, 04:14 PM
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#2
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914 Guru Group: Members Posts: 5,201 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
The printed venturi's broke?
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bulitt |
Nov 16 2013, 04:23 PM
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#3
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Achtzylinder Group: Members Posts: 4,188 Joined: 2-October 11 Member No.: 13,632 Region Association: South East States |
You say you got your carbs sorted. Possible they are running too lean resulting in a detonation and bent rod? Check condition of your plugs.
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Mblizzard |
Nov 16 2013, 04:36 PM
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#4
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
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Mblizzard |
Nov 16 2013, 04:37 PM
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#5
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
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Mblizzard |
Nov 16 2013, 04:47 PM
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#6
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
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struckn |
Nov 16 2013, 05:35 PM
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#7
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Senior Member Group: Members Posts: 1,069 Joined: 9-November 11 From: South Central York Pennsyvania Member No.: 13,764 Region Association: MidAtlantic Region |
Pull off the valve cover. You might get lucky I have not been lucky with this car yet! At idel check to see if you're blowing any gas out, also pull a plug wire off each plug one at a time and if the rpms don't drop when you pull the plug wire off of one of them you may have dropped a valve seat. |
infraredcalvin |
Nov 17 2013, 01:53 AM
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#8
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Distracted Member Group: Members Posts: 1,523 Joined: 25-August 08 From: Ladera Ranch, CA Member No.: 9,463 Region Association: Southern California |
Check for big exhaust leak near the heads. I had a smog injector plug unscrew itself on my turbo, sounded like a mechanical slap, turned out to be a $.50 plug...
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jimkelly |
Nov 17 2013, 05:05 AM
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#9
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
sounds like a very loose valve rocker.
Attached image(s) |
Dave_Darling |
Nov 17 2013, 11:26 AM
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#10
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
I've had that particular version of the sound a couple of times. In each case, it was a dropped valve seat... Hopefully this ain't one.
Pop the valve covers off and take a look. --DD |
Mblizzard |
Nov 17 2013, 02:17 PM
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#11
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Initial look with a bore sope ghrough spark plug says #4 position broken. Too much oil to see clearly. Will drain oil and look again before dropping it. F#%k.
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messix |
Nov 17 2013, 03:00 PM
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#12
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AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
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Mblizzard |
Nov 17 2013, 03:09 PM
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#13
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Initial look with a bore sope ghrough spark plug says #4 position broken. Too much oil to see clearly. Will drain oil and look again before dropping it. F#%k. piston? Yep. Auto correct and being pissed are not a good combination. |
wndsnd |
Nov 17 2013, 04:01 PM
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#14
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You wanted a horse, but got a goat. Nobody wants a goat.... Group: Members Posts: 2,861 Joined: 12-February 12 From: North Shore, MA Member No.: 14,124 Region Association: North East States |
Real sorry to hear that.
But at least it is a good time of year to pull the engine and have at it. You will be back on the road for spring! |
Dr Evil |
Nov 17 2013, 04:45 PM
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#15
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Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
Yikes, crappy luck. It could have been worse, like internal.
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Cap'n Krusty |
Nov 17 2013, 05:12 PM
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#16
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Sorry to hear that. Pistons usually break because valves hit them ..................... Occasionally they go because of FOD, like a nut or bolt falling in.
The Cap'n |
euro911 |
Nov 17 2013, 05:38 PM
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#17
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Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,851 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California |
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Mblizzard |
Nov 17 2013, 06:36 PM
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#18
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Sorry to hear that. Pistons usually break because valves hit them ..................... Occasionally they go because of FOD, like a nut or bolt falling in. The Cap'n Could not see any FOD looking in but the valves seem to be ok. This was a new build on the top end with new jugs, pistons, valve guides, and such. I am wondering if I got a bad piston? |
rick 918-S |
Nov 17 2013, 07:03 PM
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#19
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Hey nice rack! -Celette Group: Members Posts: 20,473 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
Be sure to check the rod on that cylinder. I have bent them during collision.
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Mblizzard |
Nov 21 2013, 08:44 AM
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#20
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Pictures are not of good quality but this is what I see looking into the #3 spark plug hole. Looks like the piston is cracked completely across.
Any thoughts? Does not look like a valve came into contact with the piston and there is no debris that would suggest a dropped seat. Spark plug was not damaged when removed. I have to think the piston was flawed. |
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