What causes blow by on a LB7?

Blow-by can be caused by a split injector o-ring if the compression is getting past the copper sealing washer for an injector as well. Much like @Wjackson11x said, sometimes it can be cured when doing an injector job because all those sealing surfaces and parts are moved and changed.

What causes excessive blow by in a diesel engine?

Excessive diesel blow-by can be caused by piston rings that are sticking in the bore. Diesel blow-by can be caused by piston rings that are worn out. A cylinder with worn out rings will have low compression and will likely cause a misfire. These piston rings need to be replaced.

How do you stop excessive blow by in an engine?

A solution is getting a catch can with a baffle. This is a catch can that includes a divider to keep the oil at the bottom of the can, even through turns or sudden speed changes. This protects the engine from the contents of the catch can until you can empty the can.

How much blow by is OK?

On a warm running engine, pull off the oil fill cap. If no smoke or a very light haze comes out this is normal. If it seems there is excessive smoke coming out, the piston rings or other parts may be very worn.

How do I fix my diesel Blowby?

Engine blowby can be reduced by following 2 steps : Step 1 Simply add FTC Decarbonizer in with the diesel . Step 2 Use Flushing Oil Concentrate when completing an oil change. “To fix engine blow by, FTC Decarbonizer is added to the diesel at each fill, and you literally just drive the engine clean!

How do you fix excessive crankcase pressure?

This usually happens when the engine is under load or at high rpm, which is when pressure builds up quickly and needs to be relieved the most. The extreme solution to prevent all of this is to install a vacuum pump that continuously draws the pressure out of the crankcase.

What causes excessive blow by?

While excessive blow-by can be caused by pistons and rings that are simply worn-out or were improperly prepped during a prior rebuild, detonation, overheating or a lack of lubrication can be culprits as well, quickly destroying an otherwise perfectly good set of components.

How do you test for excessive blow by?

However, one of the tell-tale signs of excessive blow-by is white smoke billowing from the oil-fill tube or opening on a valve cover. To check this, set the oil-filler cap upside down on the tube or opening. If it immediately blows off, there definitely is too much crankcase pressure.

Is Blowby bad?

Blow-by that makes it into the cylinder can lower the effective octane rating of the air-fuel mixture. If the octane rating of the air-fuel mixture drops enough, it can cause knock (also known as pre-ignition), where the fuel mixture ignites before the spark plug fires, causing very high cylinder pressures.