Head Gasket Set
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Head Gasket Set
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Late 90's Mercedes Head Gasket Replacement
In many engines, a cooling system failure precedes head gasket repair. Due to thin-walled castings, once a modern motor heats to the point of head gasket failure, the best option is often to replace it entirely with a used one. For owners of the 104 inline six Mercedes engine this is a very real concern.
This particular Mercedes engine is an extension of a motor that Mercedes-Benz first introduced in the 1960s. Throughout this engine's history, it has earned a reputation for being near bulletproof. The 104 is, for the most part, no exception. However, despite its mechanical excellence, it does have an aggravating flaw. It is prone to developing oil leaks.
The common point of leakage is where the timing cover's resilient gasket butts into the head gasket. The resilient seal sits between the upper and the lower case. Had they built this Mercedes engine like most modern motors, with a cam belt, this area would not exist. Yet here it is and this is where the notorious gasket, which is U-shaped, spongy and approximately 4mm thick, resides.
In many cases, simply sealing the upper cam housing on the 104 Mercedes engine will cure the problem. If that did not work, then the mechanic replaces the head gasket and reseals the upper cover. However, imagine explaining this to the uninitiated customer. For this reason, many repair shops simply replace the head gasket straight away. This is understandable but also unfortunate since customers could often save substantial money taking that first step.
There is a pitfall with this repair on mid-90s versions of this Mercedes engine. Those engines have serious problems with degradation of wire harness insulation. If the harness is in this condition, there is no way to complete the repair without replacing that harness, which is very expensive. Repair shops familiar with this Mercedes engine know to look for it and will often sell you that job as part of the repair.
For a late 90s and later 104 Mercedes engine, there are no real pitfalls. The mechanically inclined Mercedes engine owner can accomplish this repair. The first step will be disassembly. First, the mechanic removes the wire harness, and then he removes the head, intake and exhaust in a single unit. Then the process of removing the upper timing cover is simple.
At this point, the mechanic should familiarize themselves with the timing marks and orientation. Reseating all of this is paint by numbers except for the cam timer. The cam timer is where you will pay particular attention since a mistake will not always be obvious. This Mercedes engine can run fairly well with the cam timer set incorrectly.
In a repair shop, they will hoist the engine, which can be a bit of a challenge even with the proper equipment. It is possible to complete the repair without hoisting the engine. However, some tight fits can prove quite challenging with this Mercedes engine still in place.
The most difficult aspect of the job at this point is proper handling of the chain tensioner. The next step, sealing the front cover of the Mercedes engine, which caused the problem to start with, is rather simple. From here, the remaining job is the proverbial piece of cake.
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Take the car for a 5-mile drive. If the Check Engine light comes on, check the vacuum lines to the switchover valve. Getting them backwards is a common mistake with his Mercedes replacement engine. Once it has cleared the short run, take it on an extended test drive and do the scan verification to make sure all codes have cleared.
95 accord head gasket repair difficulty????
it began overheating 2 days ago.super hot!!! so i pull over and im out of coolant, yet i cant find a leak. so i check plugs and the two on the right side are covered in oil. And i find a dark substance resembling oil residue in the bottom of my radiator resivoir. i drove it a total of about 15 miles or less while pulling over to let the engine cool a bit and im pretty sure the head gasket is blown. Plus i found a milky greeenish substance under the oil cap (antifreeze) so all signs point towards the head gasket so my question is how difficult is it to replace cause i dont make much money and what do i need to get because the choices and prices vary dramatically from 40 or 50 for just the head gasket itself towards 190 for a complete gasket set which contains who know how many gaskets, seals, etc. but i like my car 95 accord with 100,000 miles on it, new coils, radiator, plugs rotor and i dont wanna sell it till i finish college. i need some help asap!!!
Its not hard at all as long as you can pull things apart and put them back together. The only thing that is a main concern is the torque sequence, you need to insure all bolts that need torqued are torqued exactly as stated in the manual. Also while you got the head off you need to check and see if the head warped. just run a straight edge across the head and if you can fit a feeler Gage under the straight edge according to the manual then it will have to be shaved down. other wise it will not seal right. and finally you have to drain all contaminated coolant and oil and refill with new. I hope your able to do it. you will save a large amount of money if you can. Hope this helps. Good Luck!
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