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11-22-2010, 02:51 AM #1
Mercury 2.5L 200hp EFI 2002 VST cleaning
Have the above engine, that has taken a mouthful of saltwater....
Have taken apart the VST, most of it is clean, except for the inlet needle area.
I will replace the needle, but I was also hoping to replace the seat.
The parts book and the service manual dont show a seperate seat, but looking at it, it looks like it is a seperate part... Havent attempted to remove it in case I damage it.
Can I remove the seat?? and how?? or what is the best way to clean it?
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11-22-2010, 05:43 PM #2Supporting Vendor
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Had a GREAT MERCURY MASTER tec teach me how to work VST's.. FIRST you must have a new replacement gasket BEFORE you attempt. After removing all screws I remove the needle and seat and use some rough lapping compound on the end of a Q-Tip and lap the seat surface until clean. Next clean out the rest of the tank with carb spray, I use carb spray and compressed air to clean tanks, seat area and blow out lower pump screen , then I assemble back with original needle and cleaned seat , been working like a champ for me...
BTW: This info came from Chris Justice IMO THE best Mercury mechanic on the planet !
JayJay @ JSRE
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11-22-2010, 06:02 PM #3
Thanks for the response Jay, my needle is stuck in the seat quite badly with salt... I will replace it..
The seat looks like its brass. Doesnt appear to be an obvious way to remove. How would I remove the seat?
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11-23-2010, 05:24 PM #4Supporting Vendor
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Man ya got me , never had one that was salt water infested... I might still try the ROUGH lapping compound and the Q-Tip ya might be suprised that compound is bad to da bone..
JayJay @ JSRE
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08-02-2011, 01:32 AM #5
Old thread revival...
But I thought it may help someone out some day...
When you buy the VST inlet needle from mercury, it comes with the brass seat...
I couldnt just remove the seat... maybe salted up too much... but carefully using a drill, it did come out eventually...