Piston Rod Knock?

Question

What can be done to "hide" rod knock in an older vehicle. It knocks for the first 2 or 3 minutes, then goes away. Im not totally sure that it si rod knock, compression in each cylender is ~150psi.

Its a Ford inline 6. 200cid 3.3L

Answer 1

Get some Lucas oil treatment and pour in it. If anything will hide it that will.

Answer 2

With only 60k miles it's unlikely that you have a piston slap or rod knock unless it's a ford taurus. Those cars are known to throw connecting rods with low milage. In the unlikely event that you do have that problem the longer you drive it the more serious the problem will become. With those type problems you can never tell when to rist pin or conncting rod will let go and totally destroy the engine. I would have a real mechanic find your problem now while it's not that serious.

Answer 3

Not too bad -- drop the pan and replace the rod bearings and probably the oil pump. About a five hour driveway job. Make certain it's a rod and not a weak lifter.

Answer 4

It may be lifter noise your hearing. If the compression is that good take off the oil pan and install a new oil pump and filter screen.
Remove one of the rod bearing caps and inspect the bearing.

Answer 5

Try going with a thicker engine oil. Usually oil settles in the oil pan when the vehicle is not running for a while and when the vehicle is started it takes a few seconds for the oil to circulate throughout the engine.

Answer 6

Take 90 weight gear oil and mis three quarts of it with 2 quarts of regular motor oil. That will do it for a short time. Enough to drive it down and trade it off. Another old time remedy is sawdust added to the oil. That one though can clog the screen if you use too much so don' tcare for that one. Also believe it or not, ground up banana peels work as well, but have to be ground finely. Also won' t last more than a few minutes. The gear oil trick is used at car auctions all the time. Somebody else mentioned disconnecting that cylinder wire and that can quiet it down but make motor run badly missing that cylinder. If V-8 though, you can often get away with it and pass it off as "needing a tuneup. :-) Caveat Emptor (let the buyer beware)

Answer 7

i own a repair shop,and the compression don't have any thing to do with a rod knock anyway ,,but there really isn't any way to hide it,,id just drop the pan and replace the rod bearings in it,,a very cheap repair to do,,and it should last a lot longer,,but there's no real way to hide it,,good luck,i hope this help,s.

Answer 8

What kind of car is it? It sounds more like bearing knock due to low oil pressure/wide bearing clearances. If it is the bearings,then the "used car sales trick" is to put heavy weight oil(20W/50 or thicker) in the engine and hope it sells quickly. If it is your car and you want to keep it or sell it,the BEST thing to do is have the engine replaced or overhauled.

Answer 9

you might have an loose piston rod that could possible
cause that or oil sealants must be replaced after words
go directly over to mechanics manuel read about tune ups
for car's engine completely check spectications too make, year
plus annual oil change helps

Answer 10

are you sure it's a knock or is it a tick.knock could be a rod,if it's a tick,then it's a lifter.a rod knock i would use a heavier oil,a lifter,i would use an additive ,that is on the market,or it could be dirty oil.i would also try high octane fuel.