1992 johnson 70hp avradge compression test readings|Topic: Minimum compression? – Antique Outboard : private label My compression tester would show 130 + on one of those.-----Some will argue.----Pull the cylinder head to inspect cylinder walls. 31 de ago. de 2015 · 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、影视 .
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There really is no magic number for compression. Certainly if your above 100 your good but it is more important that the numbers are within range of each other. Read the "Top . If the cylinders were all even I would suspect the compression tester. I would spray a 50-1 mix into the cylinders and let it sit over night. Then I would do another . My compression tester would show 130 + on one of those.-----Some will argue.----Pull the cylinder head to inspect cylinder walls. To do a compression test, you'll of course need to thread the tester into the stock spark plug socket. You'll then need to turn the motor over some how. Ideally, the motor would .
The type and model is what matters in an outboard’s compression readings. Not necessarily the hp or size. Some of the 9.5’s had . On the port cylinders I got 80, 76, 72; and starboard cylinders were all 72. That seems low, but since they're all close I wonder. I realize different compression gauges will .
Generally, readings below 90 PSI for modern two-stroke outboards indicate a problem; most will produce cranking compression readings in the 90 to 105 PSI range, depending on the engine year, make, and model.On a 4 stroke engine, most mechanics and dealers will perform a leak down test, to see how much pressure escapes over a set period of time. On a 2 stroke engine, a compression check .
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That's good compression number as this is the 56ci block. It has a idle relief hole in sleeve and that reduces cranking compression about 10psi..Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Here is everything that you need to know . Re: 40 Hp Evinrude Compression test If the motor sat for a while shoot some pb blaster into the cylinders and wait a while before testing. See the top secret file about awakening a sleeping outboard at the top of the page. Stuck rings may give a bad compression reading, but can sometimes be unstuck without a major teardown. Re: 115 Johnson 115 Compression Advice Not sure just what you mean by wet compression numbers. Adding oil to the cylinders temporarily skews the compression readings and is not a valid number. Compression should vary up to 10% between all cylinders. Typically, a variance of more than that and you could have some issue that should be addressed.
This is measured in psi, or pounds per square inch, and we refer to it as the compression reading. 4 stroke engines make compression differently than 2 stroke engines, but the principle is the same. On a 4 stroke engine, most mechanics and dealers will perform a leak down test, to see how much pressure escapes over a set period of time. Re: 15 hp Johnson Compression I used the same compression tester on my jet ski and it came up to spec compression. So I don't doubt its accuracy. The engine does run. It just doesn't have the power it had before. Then, screw the compression gauge into the spark plug hole until it’s secure. Turn the key to the “Start” position for a few seconds, allowing the meter to record the compression reading. The ideal compression reading for a Yamaha Outboard motor is .Things to look for: Variations of 15 Psi or more, low compression (under 110 Psi), or high compression (compression exceeding mfg`s specs). It is possible that a common compression test will not detect leak down. If your readings are within spec and you still suspect a problem with the compression do a compression leak-down test.
Re: johnson 1975 85 hp compression Thank you for checking the compression. 45LBS? Look for 100lbs each cylinder and only a 10% variance between the cylinders. What to do now? If the compression readings are correct. With a known good compression gauge. I would sit down, have a cig if you smoke, and a cold beer if you drink.
Last night I did a compression test, now that I have 100 miles on it, compression test was just a health check because I think there is something lacking power wise. . The lower compression readings have me concerned that something might be off. Save Share Reply Quote Like. BuzzLOL. 8414 posts
Keep in mind some compression testers are not all that accurate. I had two that had drastically different readings on the same motor. edit: I'm just saying I wouldn't condemn a motor based off of one compression reading, or at least confirm the accuracy of the compression tester. Just my 2 cents. About the test I did:The manual I have does not explain the proper test procedure or range. The choke was off and the gas disconnected. The spark plugs were in except for the cylinder tested. The cylinders were lubed with WD-40 before the test. I used two -40 compression test guages from the local auto parts store. Here's how to do a compression test on your Mercury outboard 2-stroke engine. Or download a repair manual instantly here. . If a low compression pressure reading of two adjacent cylinders on the engine were obtained, a head gasket may be to blame. . 70 HP 3 cylinder 1986-1989: 70HP 3 cylinder 1984-1986: 75 HP 4 cylinder Re: 1990 Johnson 200 - "normal" compression numbers? Not sure if this helps. My 93 200 has the following compression readings Port Bank top to Bottom 108 104 104 Starboard bank again top to bottom 110 115 110 Nick.
on two stroke a compression test is quick easy and painless. on a 4 stroke it is a teat on a boar hog. I cannot tell you how many 4 strokes have passed a compression test with leaking heads,leaking valves and stuck rings due to carbon. yet the compression was good and the leakage rate above 70%.
Johnson & Evinrude Outboards . Compression on a 1975 Evinrude 70 hp . Compression on a 1975 Evinrude 70 hp Thanks for the comment. Motor had not been been used since 1992. I have been trying to get it to run reliably this summer. It starts ok but once put into gear it dies. I have replaced the coils on all three cylinders and rebuilt the fuel . Re: 1981 Johnson 70HP No Compression Did you open the throttle while doing the compression test? Did you do a wet compression test? If someone was having a hard time starting this motor they could have wiped the oil off the cyls. I had this happen to a vehicle I bought. Very low compression in all cyls. Looking for some diagnostic expertise on some compression test numbers on a 1984 Johnson 90 HP V4. Done after running for a few minutes. Starboard side top - 65 / bottom - 85. Port side top - 70+ / bottom - 80-. Definitely outside the 10% and seem low but can't find what the normal compression numbers should be.
I'm looking at purchasing what seems to be a clean 1988 Johnson 70HP VRO (disconnected VRO) outboard motor. Went to look at the motor, we started it up and it ran good on the ear muffs, but only for a minute. Brought a compression tester from Autozone and removed all spark plugs per compression test thread, opened throttle and checked each .
The first compression, how long it takes for each cylinder to get to full compression and the difference between all of them. 10% is acceptable on an older engine. Much more than that, and it's time to diagnose further (like with a leak down test). Exceptionally HIGH readings across the board indicate a modified engine or oil consumption issues. Re: MERCURY 115 HP INLINE 6 CYLINDER COMPRESSION test readings, opinions please. Compression test need to be done with the throtal in the WOT position and the motor should be turned over 3 to 4 times on each cylender. From the readings posted at 3 revs everything looks good as they are all lest that 10 percent overall diffrence.
I have a ford 460 that was re-built by a machine shop before I bought it here are the specs: 460 .030 over all stock bottom end, D3VE heads stock, 9-1 compression, unknown cam grind but I was told it was a melling rv grind. My question is I did a compression test and only came up with 130 pounds pressure in all 8 cylinders.If you do a compression test, (click here to learn how to perform a compression test.) and you have the controls closed. You will see a good compression reading of 150-160 PSI. Then, if you put the handles in WOT. You will see those compression numbers come up to . Re: 1992 Johnson 200hp Compression results Static readings vary from gauge to gauge. A lot depends on what heads are on the motor are far as actual numbers go. If the motor was cold (dry) that has an effect too. The OE manual calls for the numbers to be no more than 15 lbs different.
Johnson/Evinrude DVA (Peak reading) and Resistance charts. Performing tests on ignition components requires that you have the proper equipment to do so. This chart assumes you have the adequate testing equipment to diagnose ignition problems . 1989-1992. CD3 W/SLOW. 450-600. 90-110. 150V+ 12V+ Brown to Brown/yellow. Org to Org/Blk. 35-45. 0 .
Performing the compression test with engine cold/room temperature this doesn't give a true compression reading (assuming you have an accurate compression tester) because, the internal components (piston, piston ring and cylinder) HAVE NOT expanded under heat. . 1952-1954 Johnson 3HP JW-10 Proper Compression Check Pull it till you get .
Ok, I started a thread a little bit ago about my 1965 johnson 9.5 having a "cough" at low rpm. I had taken the previous owner's word that the compression was 120 on each cylinder. I checked it and it is more like 75-80 psi. Now, I have a 1973 9.5 evinrude (basically the same motor, right??).
7. The last number the gauge jumps to is the compression for that cylinder. 8. Repeat for each cylinder. Update: It may take more than 4 revolutions to get a stable reading; crank for up to 10 seconds or until the needle stabilizes, whichever comes first. Note: If your battery is weak, the engine will turn over slower and give you lower readings. I'm having a similar issue. Looking to buy a 2003 Johnson 150 HP. First mechanic tells me to run away because the compression was 89- 95 psi on all cylinders. It was a cold compression test coming out of winter storage. We bring it to another mechanic who does another compression test.
Topic: Minimum compression? – Antique Outboard
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1992 johnson 70hp avradge compression test readings|Topic: Minimum compression? – Antique Outboard