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    driveshaft - propeller - backlash??

    Hello,<br /><br />I have an old Mariner 20HP here and when i pulled off the lower unit to change impeller and gaskets, i found, that i can move the driveshaft pretty much when in gear, before the propeller starts moving. Has this to do with backlash? In the manual they write about 0,5-0,7mm when...
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    stuck driveshaft??

    Hello,<br /><br />I searched around for a while, because my LU won't come off :) <br /><br />In almost every thread, i read the driveshaft is seized at the crankshaft. BUT, if so, how can it come off for about 1/4"? I think if the shaft is seized it won't move at all?<br /><br />thanks<br />martin
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    flywheel paranoia

    Hello,<br /><br />I read an article about micro cracks in flywheels some time ago, and now i always think what happens when a flywheel disintegrates at 4000-5500rpm. I am really scared a little. I mean, i don't know how the shop removed the flywheel, they said it was pretty hard to remove. I...
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    to hone or not to hone..

    Hello,<br /><br />I thought of using a ball hone since my engine overheated last summer and i want to put new pistons in. Pistons are scored pretty badly. Cylinder walls are OK, except for a very slight mark at one cylinder, but outside of the compression chamber (below the ports).<br /><br...
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    removing rod from a 3 Ring Piston

    Hello,<br /><br />As some of you know i try to rebuild my '76 Merc 500 the cheap way. I have 4 used pistons with rods from another engine, and since those pistons are in good shape, i'd like to use them. BUT, the bearing races of the rods are junk. Now i have 4 nice pistons with unusable rods...
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    damaged crankshaft

    Hello,<br /><br />I wanted to rebuild my old '76 Merc 500. Now the crankshaft was damaged at one of the rod bearings and i thought i could use the other one i still have in my second engine. But there, the crankshaft ist badly damaged at the lower oil seal :eek: <br /><br />Now just out of...
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    mastertech rebuild kits

    Hello,<br /><br />Has anyone ever tried those rebuild kits by mastertech?<br />I have to change some gaskets on my Merc500, which ran pretty hot this year (bad impeller). Now, for the price of the gaskets here in Europe, i could get the complete rebuild kit! Since the engine was REALLY hot, i...
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    Merc 500 overheated - no problem?

    Hello,<br /><br />First of all, YES i searched and read a lot, but just to be sure - let me post the 256th overheating Thread ;) <br /><br />I was out on the water and wanted to go up to WOT, when suddenly the rpm dropped pretty fast. Went down from 3500 to Zero in about 3 seconds. At the...
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    changing exhaust cover...

    Hello,<br /><br />I have a '72 merc 500 and a '77 merc 500. The '72 has a good powerhead but some ignition parts missing (Thunderbolt Type II), The '77 has a fine Type V Ignition, but a stuck piston :) <br /><br />Well, you guess it, i would like to put the ignition of the '77 on the powerhead...
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    restoration and prices...

    Hello,<br /><br />I have an old Merc 500 '72 4 Cyl. Thunderbolt Type II Ignition.<br />Now i get another one with Type IV Ignition, which i want to put on my motor. (same Powerhead etc...).<br /><br />I would also like to have a look at the Powerhead and do a big overhaul. BUT, when i look at...
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    which ignition coil??

    Hello,<br /><br />Finally i found out, which ignition my motor has. It's a Thunderbolt Type II (lightning energizer distributor). Thumbs up for the Seloc manual :D <br /><br />The only problem is, i can't find the ignition coil at dougrussell or partsexpress. Now i could get a coil for 5$...
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    distributor = ignition driver??

    Hello,<br /><br />A very stupid question i know :) <br /><br />My problem is, i do not know if my Mercury 500 Thunderbolt (no known serial) has a distributor. I know distributors from my cars very well, but there is nothing on my motor, that would look similar...<br /><br />I found a guy who...
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    australian serial chart?

    Hello,<br /><br />Finally, i think i found the serial number of Mercury 500.<br /><br />There IS a place at the block where the following is stamped in:<br /><br />"full jeweled super thunderbolt H" "831-1739"<br /><br />Is the 831-1739 the serial?? If it is, i can't find it in any chart. Some...
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    no serialnumber...

    Hello,<br /><br />I bought an old Mercury 500. From the late 70's i think. Problem is, i need some parts for the motor, and would like to order a service manual. But the sticker with the serialnumber isn't there.<br /><br />Now i had a look at the powerhead. there is a Number (10174002), but...
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