Exhaust manifold may be cracked or gasket is leaking. was ok but noticed over the last week a noisier startup.The engine did fire but sounded like a very old tractor and cut out after a few seconds also a lot of exhaust fumes from the manifold area. My main concern is I may have inadvertently damaged the engine as vibration and noise was quite severe on sxtart up, also hazard warning lights and alarm sounded when engine cut out?
Oil pressure gauge on startup over the last few months drops to zero after about 5 mins driving, faulty gauge/sensor or is this related to the exhaust problem.
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Re: 1995 cherokee 2.5 td 150k miles will not start.
The oil pressure dropping to zero is common for cherokees. Replace the oil pressure sending unit and it will be good as new. Cracked exhaust manifolds are also common. Usually it will crack where the 2 pipes are welded into 1 pipe before it connects to the front pipe. There are lots of replacement headers out there to choose from. I just ordered one through quadratec.
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get the engine hot,
all external leaks , tell you , who leaks.
the cap pressure is 14psi, so it will leak at the pressure
and is easy to see, just look, dont rush, look.
and behold the item leaking, if confused take a photo of the leak.
you had green fluid on the ground. right.
why is this hard?
that puddle says , im leaking and need help fast.
as leaks tend to get worse. what a burned up engine???????
It is important too identify the following:
1) The source of the exhaust leak
2) The source of the oil leak.
The exhaust leak could turn out to be a bad exhaust gasket, a cracked or loose exhaust manifold, a cracked cylinder head or bad gasket, or related parts. The oil leak could turn out to be the valve cover gasket. A dried out valve cover gasket can cause oil to sit on the spark plugs and have oil leaks. Be sure not to over-fill the oil. A machine shop can find cracks in cylinder heads. If these problems turn out to be ok (and one of those stethoscopes may be helpful) then you could procede to check fuel delivery. (there will be pressure in the lines) A lot of times connectors get corroded. I noticed on this model the sensor for the engine cooling mounted near the thermostat is very sensitive to variation. Same for the air sensors if left loose.
Two things which come to mind are the new manifold/gasket did not seat or cracked when torqued down, or there was a problem with a stud. For the stud, if the stud turned further into the head when the nut was tightened, it could have cracked the head. Some manifolds used bolts instead of nuts to fasten the manifold. Memory fails me which type you have, but you could check to see if all bolts have same Part# per Dealer and if different, the wrong length could have gone into the wrong place. For Future reference, there are some new ideas in manifold fasteners by Aftermarket makers. Each fastener is 2-piece and the seats expand when the bolt is installed. I think your new manifold cracked. Exhaust leaks sound like a knock each time that cylinder fires with the cracked port. Would like to know what you found.
could be just head gasket and bad exhaust manifold gasket (coolant leaks past head gasket into exhaust port then leaks out of exhaust manifold gasket) or it possible that head is cracked too Only way to know for sure is to remove head and inspect it
Position The Intake Manifold Gasket On The Engine.Dowels May Be Provided To Hold The Gasket In Place During Manifold Installation.. The Use Of Silicone Sealer Is Required. Especially Where The Front And The Rear Seals Meet The Side Gaskets On V-type Engines. Installing An Intake Manifold On V-type Engines Can Be Difficult. It Is Critical That You Use Sealer Properly On The Engine To Prevent Vacuum,Coolant, And Oil Leaks.
Start All The Fasteners By Hand Before Tightening. This Will Aid In Bolt Hold Alignment. Then Torque The Intake Manifold Fasteners To Specifications. Use The Specific Torque Pattern Given In The Service Manual.. Basically The Pattern Will Be A Crisscross Pattern
What normally happens when an exhaust gasket has gone and the engine has been run in that condition for some time , is , that the exhaust manifold surface bends like a banana. If you still have exhaust blow, then i suggest you take it back off and check with a straight edge to see if it is indeed bent, or has any cracks or holes, in which case you will have to take it to a machine shop for straigtening.etc Then seal the gaskets with exhaust paste and refit, all will be ok then
Hope this helps