Newly rebuilt engine doesn't cross 150psi until it's breaked down properly
So after proper break-in can we expect to have 200 psi compression?
200 psi is not normal Then normal healthy compression is 175 psi.
After that if the compression goes up it indicates the deposit buildup in combustion chamber it helps in diagnosis and rectification of premature engine failure
But the manual says normal compression is 205psi. This means a rebuild engine will have somehow lower compression than a company build engine.
What kind of manual this reference is from ? Engine repair manual has the correct specs not the user manual
Inspect the cylinder compression pressure. Install SST (compression gauge) into the spark plug hole.SST 09992-00500 Fully open the throttle. While cranking the engine, measure the compression pressure.Compression pressure (Normal condition):1,422 kPa (14.5 kgf/cm2, 206 psi)Minimum pressure:1,079 kPa (11.0 kgf/cm2, 156 psi)Difference between each cylinder: 147 kPa (1.5 kgf/cm2, 21 psi) or lessNOTICE:• Use a fully-charged battery so the engine speed can be increased to 400 rpm or more.• Inspect the other cylinders in the same way.• Measure the compression as quickly as possible. If the cylinder compression is low, pour a small amount of engine oil intothe cylinder through the spark plug hole, then inspect it again. HINT: • If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.• If the pressure remains low, the valve may be stuck or seated improperly, or there may be leakage from the gasket.
• If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.• If the pressure remains low, the valve may be stuck or seated improperly, or there may be leakage from the gasket.
This is from 2009 model passo repair manual
Why not 200 psi?
99 percent engines in Pakistan are on 200 psi when they are smoking the engine oil like nuts. And a dry engine is around 175 on normal cranking.To achieve a 450 rpm rotation we have to buckle it up with lots of amps to get the starter to rotate on that speed.
Correct see the Engine Rpm normal cars during compression test rotates at max 300
@yasiralishoro why did you sell the car??Was you not satisfied with its rebuilt. Also share your experience with Irshad bhai . I am in the process of decision making whether to rebuilt or swap. Your experience will be helpful
Sold it because wanted a change! that was the only reason, The friend who bought it from me 7-8 months ago has been enjoying it without any issues!
Irshad bhai k saath kesa experience raha?? Rebuilt krwani chahiyeh engine?
same question sir @yasiralishoro
Is Havoline 10w40 or 10w30 good for break in of rebuild engine?
I have also over hauled my passo 2012 engine 1 mon ago going well، irshad bhai is good and honest mechanic will give you reviews
@vcdwonderful how much did it cost for rebuild?
Not complete overhaul only rings and piston changed other waise every thing was fine cost around 60k with geniune parts
Sir going to change head assembly of my Passo 2005 New engine assembly costs 65000/-
Today it has been 2 yrs since i changed the rings and piston of my passo 2012 bc it was consuming oil, every thing is fine till now no oil reduction till today using shell x7 5w30 fully synthetic oil Jameel autos highly recommend, irshad bhai is gem person
Kinda wild how overhauled engines without the use of torque wrenches survive and I'm glad they do somehow. How many kilometers you've done so far?
