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Hello everyone,

we are thinking of buying a 2007 Claas Jaguar 900 Green Eye Type 493 with a damaged Mercedes OM 502 LA engine. 3500 drum hours, 4000 engine hours. The current owner is the second owner and a contractor, seller says the machine has only harvested maize for him. They suspect a piston seizure / jamming of a piston. From what I have heard of the Mercedes 502's in the Jaguar 900 often suffer from broken admission valves / intake valves but I don't know if that is true. In both cases a complete engine rework is necessary.

1. I was wondering if anyone else driving Claas Jaguars 492 / 493 with the 502 V8 engines experienced similar issues?
2. I am curious to know with how many hours yours failed, what exactly failed and what repair costs I have to expect in the worst case?
3. Is there anything else that has to be considererd besides the engine repairs / engine replacement? The engine failed during maize harvest (therefore it is still full with corn) under full throttle, maybe some belts that don't like these kind of hard stops or anything else that I am missing here?

Thanks.
 

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Hello everyone,

we are thinking of buying a 2007 Claas Jaguar 900 Green Eye Type 493 with a damaged Mercedes OM 502 LA engine. 3500 drum hours, 4000 engine hours. The current owner is the second owner and a contractor, seller says the machine has only harvested maize for him. They suspect a piston seizure / jamming of a piston. From what I have heard of the Mercedes 502's in the Jaguar 900 often suffer from broken admission valves / intake valves but I don't know if that is true. In both cases a complete engine rework is necessary.

1. I was wondering if anyone else driving Claas Jaguars 492 / 493 with the 502 V8 engines experienced similar issues?
2. I am curious to know with how many hours yours failed, what exactly failed and what repair costs I have to expect in the worst case?
3. Is there anything else that has to be considererd besides the engine repairs / engine replacement? The engine failed during maize harvest (therefore it is still full with corn) under full throttle, maybe some belts that don't like these kind of hard stops or anything else that I am missing here?

Thanks.
#1 yes
#2 3500-5000 is common for engine failure. Lifter issues are common as well as washing out rings or piston. Its common knowledge that the closer you get to 5000 hours the bigger the ticking time bomb. We have had engines go past this too without trouble but there's always that voice in the background saying how much longer will it last. An overhaul is the suggested remedy at about 5000 hours. It costs around 20k to have our dealer do the work if we pull the engine out.
#3 Most likely due to losing power its likely nothing is hurt. They should have lost power upon failure not gained anything. Probably just clean it out and it will be ok.
 

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Hello everyone,

we are thinking of buying a 2007 Claas Jaguar 900 Green Eye Type 493 with a damaged Mercedes OM 502 LA engine. 3500 drum hours, 4000 engine hours. The current owner is the second owner and a contractor, seller says the machine has only harvested maize for him. They suspect a piston seizure / jamming of a piston. From what I have heard of the Mercedes 502's in the Jaguar 900 often suffer from broken admission valves / intake valves but I don't know if that is true. In both cases a complete engine rework is necessary.

1. I was wondering if anyone else driving Claas Jaguars 492 / 493 with the 502 V8 engines experienced similar issues?
2. I am curious to know with how many hours yours failed, what exactly failed and what repair costs I have to expect in the worst case?
3. Is there anything else that has to be considererd besides the engine repairs / engine replacement? The engine failed during maize harvest (therefore it is still full with corn) under full throttle, maybe some belts that don't like these kind of hard stops or anything else that I am missing here?

Thanks.
2010 year.
Mercedes Benz / MTU / CLAAS conducted a special inspection to replace valve springs on motors up to number 942.992-00-735677
When checking / regulating the valves, if one of the springs is damaged, it is necessary to replace all 32pcs
Reinforced springs of the new sample A5410530120 (marking Orange / Lilac marked).
 
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