1999 2.5L EFI 200 question.
1999 Merc 2.5L 200 EFI. Serial # 0G883040
Motor locked up in September. Started tearing it down to swap my electrical and fuel components onto another shortblock. When I pulled the heads this evening, #5 and #6 pistons look like they weren’t gettingg oil. This motor was all original and still had the oil injection hooked up. Do I need to send my injectors off to be cleaned/tested? I’m planning on pre-mixing when I get the replacement put back together.
Last edited by StratDude; 03-18-2019 at 06:53 PM.
1999 Ranger R91 / Mercury 200 EFI.
Check your rod bearings and wrist pin bearings. If you're not getting oil it's very likely you will see catastrophic engine-wide damage (not just two pistons).
You need to determine the cause of the failure. Being as 5-6 were the cylinders down, suspects would likely be injectors, injector harness, or the most common culprit: ECU driver down for 5-6.
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Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Rod bearings blew apart on both rods. Both rods are bent. And made 1 small hole in the crank cover at #5 and 2 amall holes in the crank cover at #6. There’s also some rust in the top of both cylinders.
1999 Ranger R91 / Mercury 200 EFI.
I’m seriously considering going with carbs now instead of the EFI.
1999 Ranger R91 / Mercury 200 EFI.
These forums and all the information provided are great.
Between reading on here and another forum, and looking at the pics of my blown motor, I think it’s possible that the gasket between my block and exhaust plate may have failed and allowed water to get into the #5 and #6 cylinders.
1999 Ranger R91 / Mercury 200 EFI.
Rust in the cylinders and bent rods... You almost certainly ingested water.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
I agree. Haven’t determined how. But I’m not worried about it now. The block has too much internal damage to consider rebuilding.
1999 Ranger R91 / Mercury 200 EFI.
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