1979 351m oil changed pressure during compression test|351M compression readings : service If the wet and dry tests are faily close in psi, you can check the valves and seats by bringing each cylinder to TDC of compression stroke, and then applying an air compressor hose to the cylinder, with a special fitting that .
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Long story short, it now seems that uncorking my exhaust and going to duals has uncovered or brought to light an obvious engine problem. I did a compression test, warmed the engine a bit, tested on dry cylinders then . The best thing that can be done for a 351M is to rebuild it as a 400. The Aussie heads are going to give you a high compression ratio that will likely not run on pump gas. . I did the oiling mod external and it is real easy. There is a 1/4" pipe fitting above the oil filter. Just run a line from there to the fitting at the rear of the intake and oil the rear . To bad you didn't take compression readings before the swap. . . . . Might try squirting a little oil in a cylinder and recheck the compression and see if it goes up.
Remove the sending unit and install a mechanical oil pressure guage to test the accuracy of the original sending unit and dash guage. You can try a 20-50 oil, might help. . If the wet and dry tests are faily close in psi, you can check the valves and seats by bringing each cylinder to TDC of compression stroke, and then applying an air compressor hose to the cylinder, with a special fitting that .
351m compression specs? Quick question, seems i got rid of my manual with the last ford i got rid of, what should the compression be at when i test it on a 1979 351m? I just . The easiest way to fix the problem, and the most common, is to convert it to a 400. If you are planning to have the crank turned, it is just as easy to buy a reground 400 crank. .
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I would say the engine needs to have the pressure checked before jumping into any repairs. JCAT, the general spec for engine pressure is as follows: Cold start-up, minimum 20 .
The arrow indicates the oil gallery that feeds the sending unit from the rear end of the main distribution gallery (right side lifter gallery). An external oil line can feed pressurized .A compression test can be used to compare the compression of one cylinder to the others. An engine's cylinders need a good seal between the piston rings and the cylinder walls and between the valves and their respective seats. Wet .Ford's 335 Series engines use a bit different oiling system than most other engines, and consequently many have low oil pressure - especially at idle. In fact, both Rusty, after its rebuild, and Dad's engine, before its rebuild, had a .
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - 85 F250 351W Compression Test Results (advice needed) - Hello Gentlemen, I recently purchased a F250 351W 4x4 with 88,000 miles on it that was used for plowing. The cab was in relatively tough shape and I noticed some of the cross members are on the poor.
An external oil line can feed pressurized oil into this port, providing higher oil pressure for the last two main crankshaft bearings. Using an external oil line will improve the longevity of the main crankshaft bearings, even on a stock-level rebuild." From Bubba's M-Block Ford V8 Workshop by Dave Resch @ Bubba's M-Block Ford V8 Workshop The compression test is a procedure that measures the ability of a cylinder to contain the pressure produced while the piston is traveling upward with both valves closed. The four strokes are: Intake (piston going town, intake valve open, air . If the compression test shows that the internal pressure of the cylinder is well below the manufacturer’s specifications, then there is an internal engine problem. Part 2 of 2: Performing the compression test. Materials Needed: Compression tester; Computer scan tool (code reader) Ratchet w/various sockets and extensions
JCAT, the general spec for engine pressure is as follows: Cold start-up, minimum 20 psi during high idle, 13-16 during curb idle to warm-up Operating temp (170* F) above 15 during cruise and no less than 10 at hot idle. The pressure to be verified with a calibrated pressure gauge at the oil pressure sender port.Mid-year design changes (such as introducing new cylinder heads and retarded cam timing in the 1973 model year) . 1979 351M (car/truck) 151 @ 3400 / 156 @ 4000 . There was no significant change in the 400’s specification (compression ratio, camshaft profile and timing, etc.) from 1971 to 1972, yet the advertised power rating dropped by . 1973 - 1979 F-100 & Larger F-Series Trucks - 351M/400 Engine oil specs? - High mileage engine that sees lots of abuse (Towing, snow plowing, all weather).. and long stretches between oil changes. Ive got great oil pressure, asnd it runs well.
1973 - 1979 F-100 & Larger F-Series Trucks - 1978 ford F250 351M oil pressure low - 1978 Ford F250 V8 Four Wheel Drive 4 speed I have a 78Ford F250 with unknown milage on the engine. I believe it may have been sitting a while before I bought it. I have put about 5000 miles on the vehicle. When I startup the truck, the.
1973 - 1979 F-100 & Larger F-Series Trucks - Oil Pressure for 351M - I have a 79 Ford F-150 (4x4) with the 351M engine in it. It has 156,000 miles on it and has never needed a major rebuild. Lately the low oil pressure light (I wish I had the option with the guage!) has been coming on when I drive. Usually it doesn't. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - 351M loosing oil pressure - Hows it goin yall. i gotta 78f-250 4x4 with a 351M. The issue i have not been able to figure out is, when the engine is hot, and has been running for a little bit, when at idle, the oil pressure drops on the guage to 0. it looks like when.
It depends on what amount of money you want to spend. The 351M has a number of issues as originally built; all can be corrected, but depending on what you want it to do, it may cost a lot of $. The pistons are extremely low in the bore at TDC, (i.e. low compression height) and the common cast replacement pistons are just as bad. 335 Series- 5.8/351M, 6.6/400, 351 Cleveland - compression psi on 351m - My manual does not say what would be an adequate psi for my 76 351 m. Only that it should be even on all cylinder and 80 % of the original psi. Im guessing that 150 might be the psi of a fresh from the factory engine and that since mine is 135 on.
6.0L Power Stroke Diesel - Oil Pressure Gauge installation using Oil Cooler test port. - I finally got around to installing the sensor for the low oil pressure system in the 6.0. There are other ways to do it such as with the aftermarket oil filter cap that has a threaded hole in the top for a pressure sensor. I. The compression height of the stock 400 piston is 1.650". (Remember, the 351M uses the same rod as the 400 with 0.50" less stroke, so its piston compression height is much taller than the 400 piston to make up for .
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A compression test will reveal the state of your engine’s parts, and can potentially save you money on buying a replacement engine. . Oil Change. Pre-purchase Car Inspection. Explore 500+ Services. Car is not . If you want maximum performance and fuel mileage with your 351M-400, use a quality 5w30 or 10w30 oil only. You can use 10w40 or 20w50, but get used to more stops at the gas station with those thicker oils. To test the coolant system, do a coolant system pressure test. This is similar to the leak down test. Pressurize the coolant system, and see how much pressure you loose. If you loose pressure, it means coolant is leaking out somewhere. You can purchase both of these test kits at Harbor Freight for about each. The 351M, however, was wider and taller like the 400 to which it was visually identical. It shared almost all of its components with the 400, with the only unique parts being the pistons and the crankshaft. Since the 351M used the same block as the 400, it also used the same motor mounts and the same larger bell housing pattern of the 400.
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79 351m Been running a 351M for 25 yrs with little oil pressure at idle. Over 300,000 miles on motor with no rebuild. Can in a 1979 F150 4x4 These motors are a workhorse. Oil changed every 5000 miles good luck with your motor!, I love mine!!!!
1973 - 1979 F-100 & Larger F-Series Trucks - Changing oil pump on 78 F150-351M - Lost all oil pressure a few days ago, and now need to change the oil pump. I'd appreciate any tips on making this job easier. Looks like I've gotta raise the engine a bit to get the oil pan out of there, Need to know how much I need to. 1973 - 1979 F-100 & Larger F-Series Trucks - 1979 Ford F-250 351M Oil Filter / Oil choice - So I have drug out my truck from a fence row we’re it sat for 15+ years and we put some 10w30 in it and oil filter and it been running on that for a year but we might be pulling the motor and putting on a intake/carb and a flat.All of the 351M/400s came with 8.0 to 8.4 to 1 compression ratios (except for the 1971 400, which had a 9.1:1 CR). While even a 9.1:1 compression ratio pales in comparison to the muscle car area of the '50s, '60s & early '70s, that's about all you can feasibly squeeze out of a 351M/400 motor on the 92 or 93 Octane gasoline available today.
compression test on 351W
With your compression test results in hand, it’s fairly easy to diagnose the three most common issues that can cause low pressure: worn piston rings, faulty valves, and worn head gaskets. The first issue has to do with the piston rings, small rings .
335 Series- 5.8/351M, 6.6/400, 351 Cleveland - Best upgrades to improve my 351M's performance? - I know, I know, just get a 400M or 460, right? Except the truck I bought has a BRAND NEW JASPER rebuilt 351 modified in it. Runs good, but its a dog. My goal is to improve low-end torque, dependability and maybe an MPG or.
1948 - 1956 F1, F100 & Larger F-Series Trucks - compression test on 59 - 292 Y block - Anyone know what the pressures should be? I tested all 8 and get 75 to 80 pounds. I got 2 dead cylinders and i have spark at the plugs, im gonna put a new set in and hope that clears the problem but i doubt it. Thanks, Don
compression test for 351M
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1979 351m oil changed pressure during compression test|351M compression readings