HELP 525SC problem
 

Rolling along up on plane, next thing I hear-feel is a miss, like running on 7 cylinders. Check the spark plug wires and distributor, checks out fine, oil pressure is fine and oil is golden and full. It will hardly idle and is "ticking" not "knocking". The engine "tick" sounds like it is coming from the top of engine. Motor has 300 hours on it.

Question: Do you think it is a broken valve spring?

Re: HELP 525SC problem
 

Pull a valve cover. That should tell you a lot more. Mine was a bent push rod and a bad cam lobe.

Re: HELP 525SC problem
 

ttt

Re: HELP 525SC problem
 

I would check to see if the rotor is tight on the dist shaft first. then pull the valve cover. I spent a lot of money on the pair that I have and found that the rotor was loose, I locktited it and let it set over night like the book said and problem solved.

Re: HELP 525SC problem
 

Thanks guys, for all the info, I will check the rotor!!

Re: HELP 525SC problem
 

I would pull the valve covers, check the springs and rotate the engine to make sure everything looks ok before I ran it again.

If everything looks good then I would pull and inspect each spark plug and change the dist cap and rotor.

Re: HELP 525SC problem
 

ttt

Re: HELP 525SC problem
 

I would take it to a mechanic

Re: HELP 525SC problem
 

Just pulled it apart, bad lifter on exhaust side of #3 cylinder. You can literally wiggled the rocker arm back and forth and hear a squishing noise, off comes the blower! :(

Re: HELP 525SC problem
 

What brand lifters are you running?

Re: HELP 525SC problem
 

Wobble, I am running the stock lifters from Mercury. You ought to see the lifter, it has a pinhole in the bottom of lifter, everything else checks out OK. The valve springs are fine. Dave

Re: HELP 525SC problem
 

All I am waiting for is the Supercharger gasket. The local marina was going to charge me $64.99 for it. I went to my local speed shop, $4.62. Ya gotta love Mercury! Thanks for all the replies. Dave

Re: HELP 525SC problem
 

Good to see you found the problem.

I have been using hylomar on blower gaskets with good success over the years. Also have found that it works very well on the intake gaskets around the water ports, therostat housings etc. Seems to be better than silicone for protecting aluminum surfaces, and it just wipes off when you take the motor apart.

I pulled my outdrive last night because I saw a 1/4" drop in drive fluid level last w/e. (Top seal around input shaft is seeping.) I used hylomar on the mating surfaces when I put it in 50hours ago. No corrosion there either.

Re: HELP 525SC problem
 

Where do you buy hylomar?

Re: HELP 525SC problem
 

I have found it at autozone and O'Reilly, comes in a small tube. Permatex is one manufacturer.

Been using it for years on race cars etc. Not my choice for thread sealant, but the best for gaskets.

Hylomar® is a polyester polyol–based compound that turns from a gel into flexible putty within minutes of application. Originally developed by Rolls Royce, where it performed under the most stringent aerospace tolerances, Hylomar brings superior qualities to automotive applications. Its non-hardening formula maintains seal integrity even when subjected to thermal distortion and vibration.

Hylomar is impervious to oil, gasoline, glycol and other engine fluids. Hylomar is oxygen-sensor safe, seals gaps .01" or less, and performs at constant temperatures up to 600°F. With Hylomar, components are assembled, reused and reassembled with ease. Use Hylomar for thin gaps without a gasket or as a gasket dressing. It holds the gasket in place during assembly as well as giving a great seal.

Re: HELP 525SC problem
 

Many thanks for the info, Wobble. Lou

Re: HELP 525SC problem
 

Great info :D

Re: HELP 525SC problem
 

I'm kinda intrigued by this stuff. In a prior life, I didn't use gaskets under the front and rear of the intake manifold of my race car due to all the decking etc. I used a tube of pink jelly marketed by I believe Dow that was quite expensive. It was anerobic in that it hardened in the absence of oxygen. It was not reusable as I recall. Modern science is amazing...

Re: HELP 525SC problem
 

Hylomar not suited for big gaps like end of intake but is awesome in it's corrosion and shock resistance. My buddy used to blow out his blower gasket on his jet boat every 3rd or 4th time he had a backfire. We pulled it off 3 times to true the surfaces, when the 4th time came around we just put it back with hylomar both sides of gasket, still sealed tight now.

Re: HELP 525SC problem
 

I would change the valve springs with 300 hrs on them.

Re: HELP 525SC problem
 

I found the same thing when I rebuilt mine two years ago. So if a 60.00 gasket cost 4.00 we sould be able to buy a 60,000. merc motor for 4000.00. Where can we fine them?

Re: HELP 525SC problem
 

There is a local speed shop here in Peoria, IL called Winners Circle. You can buy them from Summit or Jegs too.