Pulled Head Could Use Some Advice. |
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1947CJ2ANOOB
Member Joined: 13 Mar. 2018 Location: Yorba Linda Status: Offline Points: 4 |
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Posted: 17 July 2018 at 1:42am |
Pulled my L134 head to really get a real report on the condition of my engine. I had reason to believe I had a blown head gasket based on having some oil in my coolant and an issue when trying to get out of neutral to first once I accelerated the jeep would die. The vehicle would start and Idle fine. Any input on if the engine would need rebuilt would be great.
All items replaced so far: Electronic Distributer Spark Plugs Gas Tank Fuel Line Carter Carb Rebuilt Rebuilt Transmission Rebuilt Transfer Case |
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wyocj2a
Member Joined: 11 Jan. 2018 Location: wyoming Status: Offline Points: 88 |
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Andrew- I'm not an expert by any means, but something looks odd in the number two jug on the top part of the piston in the photo. I don't see the same thing on the others, but it could be nothing. I'm sure you have compression numbers you could share, and that might get you some qualified help...
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Larry
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1947CJ2ANOOB
Member Joined: 13 Mar. 2018 Location: Yorba Linda Status: Offline Points: 4 |
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my compression was between 90 -110 on all cylinders
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Stev
Member Sponsor Member Joined: 27 July 2016 Location: Cincinnati Status: Offline Points: 2383 |
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Looks good what is the plan? Hone, new rings and a head gasket? Bore it over .010? Replace the pistons and rings. Be careful = Don't let a speed shop bore it over .080 just to get a extra horse out of it and kill the life of a good block for the next generation of Willys guys.
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Stev
1946 CJ2A Trail Jeep (The Saint), 1948 CJ2A Lefty Restored |
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usmcpmi
Member Sponsor Member Joined: 01 Mar. 2006 Location: Elgin,Texas Status: Offline Points: 876 |
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Does the #1 exhaust valve look suspect to anyone else? Also, the center head bolt just forward of that piston?
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'48 CJ2A/192948
'15 Wrangler Rubicon Mark G. |
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athawk11
Member Joined: 18 Jan. 2012 Location: Arvada,Colorado Status: Offline Points: 4145 |
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It does look like the stud was leaking coolant into the #1 combustion chamber. Did it smoke?
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1- 1946 CJ2A
2- 1949 CJ3A |
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1947CJ2ANOOB
Member Joined: 13 Mar. 2018 Location: Yorba Linda Status: Offline Points: 4 |
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No coolant in the oil. Just oil in the coolant.
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jeeper50
Member Sponsor Member Joined: 01 Mar. 2008 Location: Spanish Fort AL Status: Offline Points: 2579 |
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Grab the valves that are sticking up and wiggle them to gage the condition of the valve guides, rotate engine with a large socket and a long extension to get the breaker bar out in front of the bumper, I used 3/8 drive tooling. I replaced the valve guides on my engine, it had been rebuilt but the guides were shot. Can be done at home but might be something to consider that might sway your decision to a rebuild. I'm not seeing any hardened valve seat machining marks, meaning with current fuels unleaded that would be a worthwhile investment for a daily driver jeep.
If you wire brush an area next to one of the valve and look for a larger diameter machined circle around the valve, then it has the hardened seats installed. My video with valve springs removed showing guide wear, they will wiggle with springs installed, engine had a valve rattle at idle thru mid range rpms, then quieted down. Edited by jeeper50 - 17 July 2018 at 11:26pm |
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Belleview ol skool winch soon. '48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers Texan at heart,Alabama by retirement |
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usmcpmi
Member Sponsor Member Joined: 01 Mar. 2006 Location: Elgin,Texas Status: Offline Points: 876 |
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Hmmm...since no oil is pressurized in the head, and he has oil in the water and not water in the oil, would that then suggest an internal crack in the block connecting pressurized oil to the water jacket? I'm thinking he should have pressure tested the cooling system before tearing it apart.
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'48 CJ2A/192948
'15 Wrangler Rubicon Mark G. |
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wadoyado
Member Sponsor Member Joined: 29 Sep. 2016 Location: Mi. Status: Offline Points: 728 |
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"It's unbelievable how much you don't know about the jeep you've been driving all your life" (Mickey Mantle paraphrase)
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jeeper50
Member Sponsor Member Joined: 01 Mar. 2008 Location: Spanish Fort AL Status: Offline Points: 2579 |
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clean the top of one pistons to look for manuf stamping indications size ie; STD, .010, 020, 030 etc that tells you it has been at some point in it's life.
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Belleview ol skool winch soon. '48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers Texan at heart,Alabama by retirement |
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usmcpmi
Member Sponsor Member Joined: 01 Mar. 2006 Location: Elgin,Texas Status: Offline Points: 876 |
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Going back to the original post, I don't see the connection between a possible head gasket problem and the engine dying when you accelerate. Nor do i see anything mentioned about sticking valves. While it is always a good thing to look at especially when doing a rebuild, none of it helps with the main problem of oil in the water. Of course if there is oil in the water, there is probably water in the oil. It just hasn't been seen yet. But if the main issue is oil in the water, at this point, I would think there is a crack somewhere in the block. It would be advisable to check the head as well.
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'48 CJ2A/192948
'15 Wrangler Rubicon Mark G. |
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Mike S
Member Joined: 20 May 2006 Location: West Coast Status: Offline Points: 2318 |
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First thing I noticed. Valve is not the same as the others. Probably mbecause of a coolant leak. Was the Jeep smoking at all?
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'47 CJ2A -- #114542
Warn FF D41 rear Lock-Right locker 11" drum brakes Dual master cylinder T90C Transmission 16 X 6 Jeep truck wheels Cooper STT Pro tires |
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LesBerg
Member Joined: 09 Apr. 2014 Location: Athol, ID Status: Offline Points: 1554 |
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Can we get a close up of #4 with a 4k camera? I zoomed in on your motor and have concerns at the two red circled areas. The lower left circle looks odd to me. The upper right looks like a crack if you zoom in and look between the lines of green dots. You'll have to zoom in to see the dots - I didn't want to overwhelm what looks like a crack to me: let's try this. It's very faint zoomed like this, but if you can zoom on the upper right circle in your original pick, this looks very much like a crack between the green dots: If it is a crack, and you had a coolant leak on #1 where the rust is, low power and dying coming up to off-idle doesn't sound far-fetched to me. Les
Edited by LesBerg - 18 July 2018 at 11:29pm |
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1948 CJ2A 157713 24" Stretch "Old Ironsides"
1st Armored Div 6th Infantry Reg 3rd Infantry Bn Headquarters Company #161 rubigo in quo speramus - "In Rust we Trust" |
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jeeper50
Member Sponsor Member Joined: 01 Mar. 2008 Location: Spanish Fort AL Status: Offline Points: 2579 |
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Just providing info to him to make the determination about a possible overhaul, as he asked. Now back to the peanut gallery to get some more popcorn.
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Belleview ol skool winch soon. '48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers Texan at heart,Alabama by retirement |
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