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  1. blkzoe

    Mercruiser 470 - tach issue

    My port engine recently began to misbehave. 170 hp 470 w/ Pertronix ignition. Idle was OK, but when accelerating would cough-sputter then die. I would get instant restart, but no rpms higher than 2000 without issues. I chased down both fuel and electrical faults with no resolution. Then I...
  2. blkzoe

    Mercruiser 470 + Petronix II = coil failure (the amp issue)

    For all the folks going thru coils on their Mercruiser 470/Petronix II ignition setup; I may have a possible resolution. SOP for Petronix installation has always been bypass the resistor wire ( about 2 ohms resistance). Depending on the internal resistance of the coil installed, bypassing the...
  3. blkzoe

    Spring - Mercruiser 470's

    The thunder of Spring. Both engines started right up. Good oil pressure, temp stable at thermostat temp, excellent coolent flow, electrical system charging, stable idle at 750 rpm. Engine oil & filers changed. Outdrives (A1G1) drained and refilled with lube. Bottom paint good. As any boat owner...
  4. blkzoe

    Mercruiser 470 blowing coils

    I've got an interesting problem. I've got an '86 Sea Ray Amberjack with twin FWC 170hp 470's. I swapped out the points ignition on each engine and replaced with the Pertronix II 1146a electronic ignition. Yes, I bypassed the resistance wire from the choke. Both engines run like a dream. I can...
  5. blkzoe

    Aftermarket Oil Cooler for 470 Mercruiser (non-3.7lx)

    Has anyone mounted an aftermarket oil cooler on a pre-3.7lx 470? Just wondering. I've seen many offered in a variety of auto aftermarket catalogs (JEGS, etc.). I have 1986 170hp 470's that do not have oil coolers. See here for an example of the plethora of parts that are available:
  6. blkzoe

    Mercarb2 phenolic spacer

    Anybody try a .25" phenolic spacer on a Mercarb2? Not expensive, addresses the heat soak issue, a thick base gasket for the idle issue. Just askin....... http://www.ebay.com/itm/Chevy-Tri-Power-Riser-Rochester-Small-2G-Carburetor-Spacer-Phenolic-Riser-1-4-K-/261884931731
  7. blkzoe

    470 oil pressure sending units

    Installed new oil pressure gauges and sending units for my 470's to match my recent rebuilds. Oil pressure has always been a crap shoot w/ 470's so I'm a little OCD about it. Installed new Sierra sending units after taking readings off mechanical oil pressure gauges (both were 60 lbs. at cold...
  8. blkzoe

    Mercruiser "new" shift interrupt plate/switch (864363A 1)

    Does anybody have any experience with the subject shift interrupt? Is the redesign worth the cost (~$120.00)? The old design was always a problem. My switch finally crapped out and direct replacements are NLA. Really don't want to buy a used one. If worthwhile, any tricks for installation...
  9. blkzoe

    alpha 1 gen 1 upper water pocket

    Dropped the A1 G1 outdrive to replace the impeller. Drained the gear lube and thought I saw the slighest hint of white in the blue lube. Bubbles or water? Removed the cap from the upper unit to look at the gears. Perfect shape, no corrosion. Remenants of the lube looked blue 100%. Sigh of...
  10. blkzoe

    Mercruiser 470 Delco Distributor weights & springs

    Anybody know of a valid source of Mercruiser 470 Delco Distributor weights & springs? See this link. Says Delco from 1969 and up. That covers a lot of territory. Just wish to see what others have done. Thanks! http://www.jegs.com/i/Mr-Gasket/720/927G/10002/-1
  11. blkzoe

    Mercarb2 loose choke on a 470

    I was working on improving my idle on my 470s (yes, the holy grail). As my hand brushed against one carb's choke, I noticed that the choke was literally loose. I removed the outer plate (dial) and could see that the two screws that hold the choke to the carb housing were not tight. Tightened...
  12. blkzoe

    Mercruiser 470 Mechanical Fuel Pump Failure (new pump)

    My Father's Day boating failure. 3 minutes out of the dock the starboard engine shuts down; no restart. Limp back home on one engine. Determine that the fuel lines are clear, flow is good, but the pump ain't pumping. Engine starts fine on starting fluid. Pull the mechanical pump and dissect...
  13. blkzoe

    470 Coolant Hose Equivalent - WP to intake manifold

    All: I've been searching for a replcement for my 470's waterpump to intake manifold coolant hose. Mercruiser part# 32-76326 is no longer available! HOWEVER; I've located a Gates hose (#25302) with the same inlet and outlet I.D.'s (1.5" and 1.25") with a length of 15.5" It's one of the...
  14. blkzoe

    470 Teardown - hat's wrong with this picture?

    Re: 470 Teardown - hat's wrong with this picture? Here's another puzzle piece; head after clean-up, prior to re-assembly. Note coolant ports. Front is "up" on this pic (note front hose bib)
  15. blkzoe

    470 Teardown - hat's wrong with this picture?

    When tearing down my 470 I took lots of pics for reference. Take a look at this pic and tell me what's wrong. The PO made a huge error and now I know why. I believe Mercruiser has an error in their manual.
  16. blkzoe

    470 Head Bolts - Re-torque every Spring?

    All: Rebuilt one of my 470's last winter (2013). Ran like a champ after rebuild. A thought occured to me in reference to the head bolts. They were torqued in accordance with guidance from the Mercruiser manual; and re-torqued after the initial warm-up. THE QUESTION: Does anybody...
  17. blkzoe

    Mercruiser 470 (170hp - 1986) - Exhaust Manifold Erosion

    All: Please look at the pic below of my exhaust manifold. Note the erosion in the areas pointed to by the red arrows. Would this cause water intrusion into the cylinders? Fatal? Fixable? Forget it? Thanks!
  18. blkzoe

    Mercruiser 470 (170hp) - Piston #3 failure

    Re: Mercruiser 470 (170hp) - Piston #3 failure Odd you should ask: 1. I cleaned the head of piston #3 w/ a wire brush. It did have a carbon accumulation on it prior to cleaning. 2. According to hour meter 700 hrs. 3. Piston #4 was pitted on top. See pic. Pistons #1 and #2 look normal...
  19. blkzoe

    Mercruiser 470 (170hp) - Piston #3 failure

    OK folks. Has anyone seen a piston failure quite like this one? The engine ran flawlessly all last summer. Noticed a wisp of coolant vapor in Nov., right before pulling boat. Decided to do a total upper-end gasket replacement including HG as long as I was going to remove the manifolds. Lo...
  20. blkzoe

    Petronix Igniter II / Flame Thrower II (0.6 ohm) on my 470's

    Re: Petronix Igniter II / Flame Thrower II (0.6 ohm) on my 470's OK, going w/ figure #2.
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