I have a 95 mustang 3.8 i just replaced lifters and push rod cause the rods was bend and and lifters knocked hard i let it run for 30min after i installed new parts and still knocks what should i do

10

Asked by Aug 31, 2014 at 11:05 PM about the 1995 Ford Mustang Coupe

Question type: Maintenance & Repair

8 Answers

105,275

That sounds like you have plugged oil galleys or low oil pressure. How are the lobes on the camshaft?

1 of 1 people found this helpful.
72,325

If you have low or no oil pressure at idle it's probably the crankshaft bearings (rod knock). May be time for a complete engine rebuild. HTH. -Jim

10

I have good oil pressure and the lobes on the cam are in good shape. Thats why im lost.

1 of 1 people found this helpful.
105,275

It is going to be messy but you need to check to see if the oil is getting to the top of the engine, this can only be done with the valve covers off and the engine idling and see if the oil is coming up the push rods, check all of them.

10

So i did that and it is getting plenty of oil up through the push rods

105,275

Check to make sure all of the rocker arms do not wiggle when the piston is at top dead center on each cylinder, or you rerun the the lash adjustment with the engine running, after that is done and you still have the noise then you will have to find out what cylinder is making the noise. You can do that by pulling the spark plug wire off each cylinder while running to see if the noise gets lighter or stops on a particular cylinder. Make sure you insulated as spark can jump right to you. HTH

10

Ok so i removed the #6 spark plug wire and it seemed to quite down

105,275

So now you need to determine if it is a rod knock or a broken piston, it might be easier to pull off the oil pan and check number 6 rod bearing, if it's scored the crankshaft then it's time for a engine overhaul or replacement. If the crankshaft is not scored then then you might get by with a crank kit but the engine will have to come out.

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