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aaron72914 |
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#1
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Newbie ![]() Group: Members Posts: 16 Joined: 20-September 12 From: Republic, KS Member No.: 14,957 Region Association: None ![]() |
I heard a not so good noise just driving in town. I was only 4 blocks from home so drove on home, put it in the garage and shut it off. Finally got the time to tear into it (a little over a year later) (IMG:style_emoticons/default/sad.gif) and this is what I found. I'm not really sure what would cause this. I rebuilt this engine back in 1998, so I guess I can't complain too much. Just curious if anyone has seen this happen before and what might have caused it.
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76-914 |
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#2
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Repeat Offender & Resident Subaru Antagonist ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 13,508 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California ![]() ![]() |
Any slack or wobble at that wrist pin? I've destroyed the top of one but never the side of one. Was there any piston slap before hand?
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aaron72914 |
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#3
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Newbie ![]() Group: Members Posts: 16 Joined: 20-September 12 From: Republic, KS Member No.: 14,957 Region Association: None ![]() |
I haven't checked for slop on the wrist pin yet, but didn't notice any piston slap before hand. No real warning signs of any kind....running fine, then just broke.
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76-914 |
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#4
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Repeat Offender & Resident Subaru Antagonist ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 13,508 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California ![]() ![]() |
Looks like it separated at the oil ring landing. Jake will have the definitive answer if he sees this.
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Dr Evil |
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#5
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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 ![]() ![]() |
I am wondering if piston defect. Weird break.
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malcolm2 |
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#6
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States ![]() ![]() |
I had a Type 1 bug cylinder break in the up and down orientation. It was one of the cylinders next to the flywheel. The other side was cracked but had not broken yet. I figured that end had extra vibration. (IMG:style_emoticons/default/confused24.gif)
As we dug into the engine on that car, we found out that a PO had used JC Whitney parts, or maybe the whole engine, I can't remember all the details back that far. So in 1982 we chalked that one up to lower quality parts. I haven't bought anything critical from JC Whit. since. |
scotty b |
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#7
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rust free you say ? ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 16,375 Joined: 7-January 05 From: richmond, Va. Member No.: 3,419 Region Association: None ![]() |
(IMG:style_emoticons/default/blink.gif) it may just be the angle you took the pic, but did you leave the rd bushing out ? That wrist pin looks WAAYYYYY off center of the rod end.
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flash914 |
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#8
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Member ![]() ![]() Group: Members Posts: 124 Joined: 1-January 11 From: littlerock CA Member No.: 12,554 Region Association: Southern California ![]() |
I wonder about overheat and collapsed the skirt till it broke off. If you look at the crown of the piston at about 1 o'clock it looks like scuffing or metal movement. I think I would check my temps/ cooling system when it went back together. Gordon
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colingreene |
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#9
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Senior Member ![]() ![]() ![]() Group: Members Posts: 729 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California ![]() |
Check the piston to wall on the other cyls.
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Cap'n Krusty |
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#10
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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 ![]() |
(IMG:style_emoticons/default/blink.gif) it may just be the angle you took the pic, but did you leave the rd bushing out ? That wrist pin looks WAAYYYYY off center of the rod end. Looks fine to me. The pin floats in the wristpin bushing, and it looks square in the rod. The Cap'n |
aaron72914 |
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#11
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Newbie ![]() Group: Members Posts: 16 Joined: 20-September 12 From: Republic, KS Member No.: 14,957 Region Association: None ![]() |
Thanks for all the suggestions and observation. I will definitely take them all into consideration when I continue this rebuild. I am also concerned the it got too hot, but have not found anything wrong with the cooling system...ie. blower, oil cooler, and cooling fins all look good. oil was full and clean. Could the oil pump have failed?
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ClayPerrine |
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#12
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Life's been good to me so far..... ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 15,512 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille ![]() ![]() |
If the oil pump had failed, you would have destroyed a rod or main bearing before the piston skirt failed like this.
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aaron72914 |
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#13
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Newbie ![]() Group: Members Posts: 16 Joined: 20-September 12 From: Republic, KS Member No.: 14,957 Region Association: None ![]() |
Thanks ClayPerrine, I did some resource after I posted that and realized exactly what you said. So, does the oil pump push oil through the oil cooler also, or how does that work?
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SLITS |
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#14
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"This Utah shit is HARSH!" ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None ![]() ![]() |
Thanks ClayPerrine, I did some Oil pump feeds all the galleries which feed the rotating/reciprocating parts (mains, rods, valves, cam, etc. It also pushes oil thru the cooler and filter. Air flow through the cooler is something else. If your thermostat is working that control the flaps in the blower housing, the cooler is bypassed when the engine is cold. |
aaron72914 |
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#15
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Newbie ![]() Group: Members Posts: 16 Joined: 20-September 12 From: Republic, KS Member No.: 14,957 Region Association: None ![]() |
Thanks Slits. I'll check thermostat and flaps with a heat gun before re-installation.
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