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MYTHBUSTERS.........500 EFI valve springs - Powerboat Forums at …
https://www.speedwake.com/threads/mythbusters-500-efi-valve-springs.20212/#:~:text=HP500%20EFI%20do%20not%20have%20valve%20spring%20problems.,he%27d%20like%20to%20verify%20what%20you%27re%20telling%20him.
Offshoreonly.com - Mercury Racing blue motors: 500EFI, 525 EFI, …
https://www.offshoreonly.com/forums/general-q/242108-mercury-racing-blue-motors-500efi-525-efi-575-sci-pros-cons-maintenance-etc-2-print.html
Problem is that Merc told CMI what grade stainless to use (lower) and to bypass the heat treating of the finished tubes. So what happened, the headers crack leak water in the engine and if not caught will quickly destroy it in short order. It seems standard CMI's are fine but the Merc/CMI headers really gave CMI a bad rap.
Offshoreonly.com - Mercury Racing blue motors: 500EFI, 525 EFI, …
https://www.offshoreonly.com/forums/general-q/242108-mercury-racing-blue-motors-500efi-525-efi-575-sci-pros-cons-maintenance-etc-print.html
500 EFI - basically no problems except some (rare) had head gasket leaks -that may have been from too high water pressure due to LWP B1 drives that debuted about the same time. On a Fountain with a pair of 500 EFI's and LWP B1's it was easy to develop 35+ psi water pressure ... merc made a blowoff valve kit that could be installed to limit pressure.
Potter On Performance: Upgrading the Mercury Racing …
https://www.speedonthewater.com/potter-on-performance-upgrading-the-mercury-racing-500-efi/
One of the most popular engines Mercury Racing ever built was the 500 EFI. This engine has been used in a wide variety of vessels from family sportboats to multi-engine poker run boats—and even offshore racers. As these engines reach rebuild time, we are often asked about upgrade options.
Mercury Racing 500 EFI Startup And Idle - YouTube
https://www.youtube.com/watch?v=I6KM33J4HFA
This is a short start up and walk around of my Mercury Racing 500 EFI.
Merc 500efi top end refresh - River Daves Place
https://www.riverdavesplace.com/forums/threads/merc-500efi-top-end-refresh.145965/
Reaction score. 28,762. I would say you could have the the heads freshened up with new seals, springs and valves / valve job and guides checked for $1200 or so. Then you have the cost of labor to remove / replace heads, cost of gaskets, etc.... I think most shops charge somewhere around $100 an hour for labor.
MYTHBUSTERS.........500 EFI valve springs - Powerboat Forums at …
https://www.speedwake.com/threads/mythbusters-500-efi-valve-springs.20212/
HP500 EFI do not have valve spring problems. The problems were with HP500 (carbed) engines where the inner springs were cracking or breaking. Tell your potential buyer to contact Merc Racing directly if he'd like to verify what you're telling him. Regarding the second part of your question. Merc builds engines that last hundreds and hundreds of hours.
3 Approaches For Fixing Mercury 4 Stroke EFI Problems
https://funcfish.com/mercury-4-stroke-efi-problems/
1. Loss of Power You’ll often find users complaining about this issue after taking their outboard out of the storage... 2. Acceleration Problems Aside from the loss of power, there have been a ton of reports reading acceleration issues with... 3. Stalling Problems
Life expectancy of the mer HP 500 EFI - iboats Boating Forums
https://forums.iboats.com/threads/life-expectancy-of-the-mer-hp-500-efi.649600/
Need top end refreshed every 200 to 300 hours just as the 525 and 575. Around 600 plus hours they start getting tired and need a rebuild. Main issues folks have had is with the Merc headers, Merc are crud. Need to have CMI or better headers installed to …
Merc 525 vs Merc 500 HP - Performance Boats Forum
https://www.performanceboats.com/threads/merc-525-vs-merc-500-hp.63612/
There were two versions of the HP 500 carbed. The HP500 Bulldog was the 540 ci and was indestructable. The HP500 was a 502 ci and suffered valve spring problems after a couple of hundred hours. New springs, and they were a great motor. The 500 EFI had far fewer valve problems. All were rated at 470 hp.
Mercrury Racing 500EFi Supercharger Rebuild
https://www.jonbondperformance.com/product/mercrury-racing-500efi-supercharger-rebuild/
Mercrury Racing 500EFi Supercharger Rebuild. $ 875.00. Mercruiser 500EFi rebuild Services. Mercrury Racing 500EFi Supercharger Rebuild quantity. Add to cart. SKU: Mercruiser 500EFi rebuild Services Category: 500EFI 2.3L Tags: 500 EFI …
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