jeep 258 compression test|Significantly higher compression in one cylinder, jeep 258 : agent I need to run a compression test on my AMC 258 i6 / 4.2l , so today I was searching for acceptable values from a test. What I found was that it should be 120# - AMC .
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You need to compression test all cylinders and check variances between them and do a wet test to isolate valve leakage as opposed to ring leakage. If you had around 140 psi +/-10 psi on all cylinders in a dry test you would be just about right for the age and could not expect .
The motor runs really well, but I had some problems earlier this year that turned out .
The FSM specifies three compression strokes so the 120-150 psi compression . The motor runs really well, but I had some problems earlier this year that turned out to be a misadjusted float on the new er carb, and some suggestions here were to check . You should be between 120-150psi on your 4.2L 258 Compression. HF has a cheap version of the screw in type, you'll need to get a compression tester with the correct . I need to run a compression test on my AMC 258 i6 / 4.2l , so today I was searching for acceptable values from a test. What I found was that it should be 120# - AMC .
Significantly higher compression in one cylinder, jeep 258
My 84 Jeep CJ7 with AMC 258 i6 / 4.2l /MPFI at about 203k miles is losing oil, presumably from blow-by. I see pools around the oil filler cap, ccv and around the valve cover .
Many on the latest Jeep Forums will build the 258 with 4.0l 6.125" connecting rods and custom pistons and call it a day. Getting quench height to 0.040" is optimal for . When you have two adjacent cylinders with zero compression, suspect a failed head gasket. The seal between the two cylinders may have blown out, and neither cylinder .
A compression test MUST be done with throttle wide open! There is no other proper way. You are seeing the compression of the intake air, you do not want it restricted in any way. The FSM specifies three compression strokes so the 120-150 psi compression spec is probably based on this. You might try doing another test with a fully charged battery, the .
Is timing affected by compression?
What are the correct proceedures for compression testing my 258? I have decided to add an FI kit so I can actually get this thing back on the trail. I don't want to spend .
If one cylinder is significantly (20 or more lbs) lower than the rest it has a problem. If any cylinders have no reading or are in the 5-10 lb area, they have a serious problem. You can do a wet compression test to further diagnose poor compression if you like. A wet compression test puts oil in the cylinders to seal up the piston rings. Proudly sponsored by Enginetech https://enginetech.com/Engine rebuild kit I used on my 4.0L rebuild: https://amzn.to/2WuNdbu0 Wholesale discount code: Je. my 72 cj {which has a 76 i think, 258 motor} smokes when starting, but seems to run ok most of the time. i have heard the valve seals can make it do this. not knowing much about the motor, how many miles etc, i decided to do a comp. test on it. it went as follows from the cylinder nearest the radiator which i will call 1. 1 120 psi 2 120 psi 3 . Factory compression specs for the 258 is 120-150 psi, with no more than 30 psi difference between cylinders. So, you are at the lowest end of factory spec in 5 cylinders and way below spec in #6. A leak-down test would tell where #6 is losing compression, but it's probably the rings. Either way, I'd start saving your pennies for a rebuild.
I NEED HELP with these Compression Test Results
The first thing they did was a compression test, the #1 cylinder was at 70, #2 at 90, #3 95, the remaining 3 were above 100psi. They recommend rebuilding/replacing the motor. . Easy Fix for Jeep 258 Carter BBD Idle Problem If it doesn't show up as a link, simply Google it. It's a cheap and easy fix. The instructions don't state to, but I took . I have about a 1975 - 1979 258 that has set for about a year that we cannot get running. Has great spark, is getting good clean gas to new carb, almost fires at times, but we cannot get it to run. When we check the compression all cylinders are beweeen 85 and 90psi. When we squirt oil in cylinder and recheck, we get no changes.
98 4.0 compression test. Jump to Latest . im gone ride the Jeep and test it hot,what should the compression be I'll post the hot test results. . does any have a link to a complete low buck stroker build,cost and whick 258 crank to use on a 98 engine? Pincho De Lapiz. Save Share Many on the latest Jeep Forums will build the 258 with 4.0l 6.125" connecting rods and custom pistons and call it a day. Getting quench height to 0.040" is optimal for performance and fuel. This typically is the budget build with the best .
I've rebuilt a few Jeep engines, including the AMC 258 i6 / 4.2l. Not really difficult at all, just time consuming. I wouldn't recommend tearing into anything until you've done a compression test. You can pick up a decent compression tester at any parts store, mine was around . A good investment and beats spending k+ on a rebuild which you .
I have been trying to make absolute sure my jeep I bought is a 232 and not a 258. . Dont hold me to it .. but I think the only way you can check is to do a compression test... 1976 CJ5 - 232 I6, MC2100, YJ Booster, Front disc conv, 2.5" BDS, 1" Body Lift, .5" lift Daystar Shackles, 33 x 10.50 BF KM2, Twin Stick The standard is three revolutions for an I6 258 while doing a compression test, would that be standard on all gas engines? After warming up the engine I preformed a test with three revolutions (115, 115, 130, 125, 150, 130) for kicks I preformed the test again using 4 revolutions (160, 140, 155, 150,160, 150). Compression test 150 to 160 cross all 6 cylinders, Air test putting 80 psi into cylinders using adapter I have serious air flow coming from #1 cylinder out from crankcase. Your thoughts & suggestions . Jeep was running before I completely finished cleaning the head, piston tops, the exterior, lapped the valves, and cleaned/resealed all gasket seating surfaces , but now the 258 won't turn over. . I know this firsthand because some "idiot" forgot to disconnect the fuel line to the mechanical pump when performing a compression test and got a .
1986 Jeep CJ Mostly stock, 258 c.i.d., T-176 tranny, Dana 30 front, AMC 20 rear, Dana 300 t-case, 31x10.50 tires, 2 inch body lift. Jul 24, 2010 . Remember, a compression test is a quick test to get you going in a certain direction. As you stated, your cylinders are within spec. What you are looking for is the odd ball number. ive never held the throttle open and have never, and i mean never, had any problem in getting a good reading. if you have a air compressor you can connect the hose to the compression tester and shoot air into the cylinder. if you hear air coming out of the valve cover where you put oil then its valves, if you hear it coming out the exhaust pipe then rings. Compression test (wet and dry) and leak down test. A dry compression check will show if you have low compression. Adding a squirt of oil will tell you if the loss is in the valves or rings. A leak down will tell you if you have leaking intake valves or leaking exhaust valves. It's quick and will give you a place to start. 1984 jeep cj7, 258 bored 060 over . I6, rebuilt T5 Dana 300, dana 44 tru trac dana 30, 4.10's 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Holley sniper efi . factory tach. factory clock , herculiner. Yj tub . Garvin front and rear bumper tire carriers . White knuckle rock sliders
Compression testing
10. Were the engine mine I'd do a compression test, 11. To see how the rings fared, 13. Pull the head, 14. Take it to a machine shop for refurbish, 15. And remove the carbon from the top of each piston, 16. And install the rebuilt head, 17. And go from there if the Compression test was OK. After about a month off from playing with the Jeep because of work and family, I was finally able to perform a compression test tonight. The results were fine for cylinders 1,2,4,5 & 6. . Btw, it's an '87, 258, automatic if that helps. 1987 YJ, 4.2L, Auto. Save Share
I wanted to run a compression test just for the information not because anything was obviously wrong. I ran the test cold without warming the engine to operating temperature. Test #1 taking readings on the 3rd cycle: cylinder 1 = 100psi, 2 = 90, 3 = 100, 4 = 95, 5 = 100, 6 = 100. Test #2 was cranking until the max pressure was achieved.
What should compression psi be for each cylinder on a stock 4.2 that has been rebuilt? Cylinders honed, not bored. The head was rebuilt but not deck shaved. 90 model. Carbureted, of course. My compression gauge is reading 82 to 87 psi on all 6 cylinders. That seems awful low to me.Here is a displacement and static/dynamic compression ratio calculator. While intended mostly for Jeep engines, it'll work just as well for any other engine too as long as you can provide all the necessary specifications. If you can't find some of the numbers, just leave them as is. . ↳ Test; Homepage; All times are UTC+01:00; what is the compression suposed to be on a 1983 jeep cj7 258 straight 6 cylender - Skip to content. Buy. Used cars; New cars; Certified cars . / what is the compression suposed to be on a 1983 jeep cj7 258 straight 6 cylender. . To perform this test hook vacuum gauge directly to manifold vacuum. 1. Low steady needle usually indicates leaky .
When doing a compression test, I thought I read that you have to have the carb closed. Is this true and what happens if I dont have a carb on the engine? Can I still get an accurate result? . The plug I took a picture of looks like what my 3# cylinder looks like in the 258 that is in my jeep now. I suspect that cylinder valve seal is faulty. I just performed a compression test on my 85 258. 1. 90 2. 85 3. 80 4. 90 5. 80 6. 85 . A forum community dedicated to all jeep owners and enthusiasts. Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and .
Compression Testing: Correct Method?
How To Test The Engine Compression. Dodge Ram 1500. Jeep Commander. Jeep Grand Cherokee. Dodge Dakota. Dodge Durango. Symptoms of Low Compression or No Compression in one or two cylinders. 4.7L Dodge Dakota, Durango, 1500 Pickup. 4.7L Jeep Commander, Gran
i did a compression test today, here are specs: cyl. #1 at 78 psi cyl. #2 at 120 psi cyl. #3 at 110 psi . they must be using a softer alloy in 4.0 than they did in the 232-258 engines. It was harder than heck to scratch them . let alone wear them out. . The Compression on my 2000 Jeep Grand Cherokee 4.0L. Does anyone know if these .
Compression Testing the Willys Engine
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jeep 258 compression test|Significantly higher compression in one cylinder, jeep 258