Broken oil pump
 

Just pulled my roadster a part to find broken oil pump mellings m55 new style.
Motor is 400 inch motown block eagle crank, rods and wiseco pistons, soild roller cam and stefs pan.
This is the second pump.
First time no proplems this time crank spun 3&4 main bearings
My research has turned up, pump casting junk, arp dist. shaft not flexable, solid motor mounts and fluiddamper NG.

Any insight or help greatly appreacated.

Ronnie Scott
Super Rod 1918

Re: Broken oil pump
 

When you say new style pump ... ?There are numerous posts on the net regarding Melling's lightening of M55 pump castings and their subsequent recommendation to use a Melling Select Perf. pump with a number something like #10550 and 10551. Is this possibly related to your pump failure?
I have used solid mounts forever along with a Fluidampr on a 454 and never had a oil pump issue.

Re: Broken oil pump
 

Tim H.
I starting to find out that the warning that came with the pumps wasn't attached or I missed reading them.

Thanks,

Re: Broken oil pump
 

The only time we've had problems with a broken oil pump is when there is a balance problem (for example, a customer put an internal balance flexplate and/or balancer on an external balance engine, or the weight came off the flex plate). The Melling Select pumps are better pumps, and Melling just recently beefed up the base M55 casting. I've also had excellent luck with the Moroso blueprinted pumps. If you're spinning main bearings, you have some other serious problems going on, unless you accidentally made a pass after the pump broke and you had no oil pressure.

If you have a Fluidamper, find someone you hate and give it to them. Your clue that it (the Fluidamper) is going bad is the crank will break, or some other part will fail, such as the cam drive, and they all go bad because the viscous fluid fails and the internal weight welds to the outer housing (at that point it becomes a solid hub that is NOT balanced, and is not absorbing anything but your money). There's nothing wrong with ARP oil pump drives. Solid motor mounts will only cause a problem if there's a balance problem already, then they'll make it worse.

Re: Broken oil pump
 

Thanks Alan,
I have started my list to give the damper away. Maybe a lottery?
Thanks for the info.

Re: Broken oil pump
 

Maybe get a Moroso billet pump?

Re: Broken oil pump
 

Ronnie
I sent you an email

Re: Broken oil pump
 

Thanks Rod,
Great information.
Will head in that direction. Thanks again
Ronnie Scott