jeep cj 258 compression test|Compression testing : fabrication I need some help interpreting these compression test results. I have a AMC 258 4.2L, in a 1978 CJ7. I did a dry compression test today trying to determine if I have a leaking .
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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 compression. I’m pulling about 21-22 inches on the vac gauge.If you suspect rings that are worn (or much else for that matter), the only true test .I need some help interpreting these compression test results. I have a AMC .The compression gauge was recently calibrated (I worked in a calibration lab). .
If you suspect rings that are worn (or much else for that matter), the only true test that doesn't waste your time and will give you accurate answers is a leak-down test. Do some . I need some help interpreting these compression test results. I have a AMC 258 4.2L, in a 1978 CJ7. I did a dry compression test today trying to determine if I have a leaking . 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 . 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 .
There are commercial test kits that can check your antifreeze for combustion leakage using chemicals if you want to pin down the problem more. Hopefully all your . HI I have an 81 CJ7 with the 258. The only change to the engine is the weber carb and of course stripping down the vaccum pcv system. I have an excessive. The compression gauge was recently calibrated (I worked in a calibration lab). Compression test was run for 3 compression strokes. The FSM specifies three compression .
Compression Pressure for a 258 is 150 psi with a 20 psi maximum variation between cylinders. After the compression test my son and I pulled the engine on his 79CJ5, . 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 .All about the Jeep AMC 258 I6 engine. Sponsors: Most Popular: 258 Carter BBD Idle Problem . CJ-7 Dana 30 Axle Dana 44 Axle Front Dana 44 Axle Swap Jeep CJ Gauge Jeep Engine Upgrades Jeep Tires Jeep Transmission Rear Dana .
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 30, 2010 #41 . Did a compression test, a manifold vacuum test, and fuel pressure test. They were all within specs. I also rechecked the timing (still set at 8 degrees), and sprayed around the base of the carb . Another Compression Test Question Old Dog Always Off-Roading Jeeper. Posts 13,886 Media 82 Thanks 5 Location Stonelick Lake, Ohio . 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 30, 2010 #40 I am still trying to understand my project and its lack of power at high speed. So, I did a compression test this morning and got the following: Cyl 1: 150 Cyl 2: 140 Cyl 3: 142 Cyl 4: 160 Cyl 5: 158 Cyl 6: 162 Frankly, I am not sure what . HI I have an 81 CJ7 with the 258. The only change to the engine is the weber carb and of course stripping down the vaccum pcv system. I have an excessive amount of oil flowing NOT BOILING out of the dipstick tube. I also have the following compression readings Front to back #1 125 #2 130 #3.
Significantly higher compression in one cylinder, jeep 258
I swapped in a T-18a later. If I decoded the CJ-5 VIN, it showed a 232. Now on my 1976 CJ-7, which I purchased in pieces, the VIN decodes as having the 304 V8 with auto and quadra-trac, which wasn't there when I purchased it. The frame and body had seen its better days on the CJ-5 so the entire drivetrain, axles and suspension were moved to the . 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. Jeep CJ Forum 258 Dead Cylinder, Low Compression . I have a 258 with about 2000 miles on rebuild. MC 2100, manual choke, headman headers, bored out .60, mild cam. . Well, we did a compression test, the shop didn't have a leak down tester, and found low compression in that cylinder, but not steady. . 1986 cj7 258, t-176 4-speed, d-300, moser one piece axle in back in amc 20,G2 4.10 gears front and back, detroit truetac front and back,G2 4340 chromoly front axles in a d-30, 4" rough country lift, 33" tires
Jeep CJ Forum 258 compression test / white smoke problems . 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 .
Another Compression Test Question Old Dog Always Off-Roading Jeeper. Posts 13,886 Media 82 Thanks 5 Location Stonelick Lake, Ohio . 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. Aug 10, 2010 #78
1979 Jeep CJ7 TH400 Automatic 258 I6 Quadratrac Amc 20 rear & Dana 30 front, 32 x 11.5 x 15 tires. Currently a Complete Custom Rebuild in progress. . Hopefully I can do a compression test and post a pic of my intake at a minimum. I appreciate the suggestions. Turbogus Old Time Jeeper. Posts 1,232 Thanks 2 Location Albany, OR 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 am a new owner of an 84 cj7 with a 258 I6. It was rebuilt in 2013 (I have the receipt) but then the jeep sat for 3 years. . It is at a shop now getting a compression test and an overall assessment so I will keep everyone posted. Thanks! . Help support Jeep-CJ.com by making a donation. Goal. 0.00. Earned. 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..00. This donation drive ends . 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).
No compression test yet. Will search how to do tonight also and try in the am. . 85 CJ7, 258 TBI, MSD6 Ign. TeamRushed TF727, Twinstick D300,outboard shackle rev. f+r Locked Scout D44's , 3" lift, 33's . Jeep-CJ.com is the first and largest CJ community with forums, galleries, files and more. Navigation. Forums; Whats New;
Let's look REALLY HARD at the firing order. and if the distributor cap or plug wires aren't new let's get 'em replaced. In fact. if the firing order is definitely right, I'd be tempted to replace the cap even if it's new - sometimes a factory .
Your metering pins look like they're in the perfect position. I can't think they're responsible for. your Jeep sputters & won't run if you romp on it. Let's look REALLY HARD at the firing order. and if the distributor cap or plug wires aren't new let's get 'em replaced. In fact. if the firing order is definitely right, I'd be tempted to replace the cap even if it's new - sometimes a factory . 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. . Some plugs are worse than others . I got a too high readings on my compression test of all cylinders. .my pvc rattles, nothing clogged and it's .
Jeep CJ Forum. Compression Test. Jump to Latest 795 views 3 . I just performed a compression test on my 85 258. 1. 90 2. 85 3. 80 4. 90 5. 80 6. 85 The engin was cold and the carburetor butterfly plate was not open. I know this is low but do you think is is because I did not do a proper test?1986 cj7 258, t-176 4-speed, d-300, moser one piece axle in back in amc 20,G2 4.10 gears front and back, detroit truetac front and back,G2 4340 chromoly front axles in a d-30, 4" rough country lift, 33" tires . This motor has compression of 135-120 when cold with all plugs out,and 145-115 when hot I know the rings are bad cause i have alot of .
1985 Jeep CJ7, 258, t-176, D300, AMC20, D30. Feb 18, 2010 . but on the manifold side there's no compression fitting and o. The carb, the compression fitting isn't tight at all. Is this really a vacuum line? . Jeep-CJ.com is the first and largest CJ community with forums, galleries, files and more. Navigation. I did a dry compression test and these are what I got: 1 - 140 2 - 140 3 - 140 4 - 140 5 - 143 6 - 140 7 - 145 8 - 140 (~+/- .5) Based on those numbers I think I'm in a pretty good range but I still can't figure out why I'm getting oil out of the fill tube. All emissions is disconnected leaving just the PCV valve and a vented oil cap. One other test is to open the rad cap on an off cold engine and then start it up to see if smoke is pouring out the rad opening. You can also hold your hand over the rad when it is first started and still cold to feel for compression chugs. Then watch while it warms up for little bubbles in the coolant like this that indicate a blown head gasket: I need to run a compression test on my 258, so today I was searching for acceptable values from a test. What I found was that it should be 120# - 150# with all cylinders within a 5% - 10% max difference. These numbers seemed good to me and were within the range of what I remembered.
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I NEED HELP with these Compression Test Results
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jeep cj 258 compression test|Compression testing