Merc. 420 eng. ?
#1
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Merc. 420 eng. ?
What's the scoop on them? Did they have a crank case PSI. problem?,I was told it is normal for them to blow the dip stick up about an inch at WOT.
I have a friend that is looking at a set for his 90 Scarab that has about 1000 Hrs on old 454 mags. For the price he can get the motors for it will be cheaper that rebuilding his, he may have a crack somewhere ( milky oil ) in one motor.
I have a friend that is looking at a set for his 90 Scarab that has about 1000 Hrs on old 454 mags. For the price he can get the motors for it will be cheaper that rebuilding his, he may have a crack somewhere ( milky oil ) in one motor.
#3
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Re: Merc. 420 eng. ?
I had one in my old Formula and never had any problems what so ever. They have all the good parts in them (internals) and historically were great reliable engines.
Craig
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Happily retired and living in Heavens waiting room.
Last edited by craig223; 12-15-2004 at 08:16 AM.
#4
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Re: Merc. 420 eng. ?
No big block should have that much crankcase pressure. It's usually caused by blowby past the rings. That engine would have to be torn down and inspected, possibly rebuilt.
#7
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Re: Merc. 420 eng. ?
Lapse...
Rings were obviously worn or some restriction must have been
present in the vent system to have oil out the dipstick. I have seen
oil present in the bottom of a distributor upper housing before, but
it was due to the owner having changed the valve covers and not
installed proper breathers.
I just freshened a set of HP 420'Sfor a person that had one wipe a cam
lobe out, but everything else was in great shape at 600 hours. Cam shaft
was just a random case since the lifters looked acceptable, and the other
motor's cam was re-used after all the lobes were inspected.
These are great pieces for what they were designed to do.
OR
Rings were obviously worn or some restriction must have been
present in the vent system to have oil out the dipstick. I have seen
oil present in the bottom of a distributor upper housing before, but
it was due to the owner having changed the valve covers and not
installed proper breathers.
I just freshened a set of HP 420'Sfor a person that had one wipe a cam
lobe out, but everything else was in great shape at 600 hours. Cam shaft
was just a random case since the lifters looked acceptable, and the other
motor's cam was re-used after all the lobes were inspected.
These are great pieces for what they were designed to do.
OR
#8
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Re: Merc. 420 eng. ?
These were great motors! The 454 cubes and the internal performance upgrades to produce this Merc 454/420 hp was a perfect mate to the TRS.The Gil Exhaust, and Crane guts along with the raspy sound of healthy power, is absolutely awesome. I am sure Arronow was proud to be running the iron.
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Re: Merc. 420 eng. ?
The guy told him Merc. said they all do it and to put springs on the dip stick to hold it down they only have 206 hrs on them he says, but I don't tink they should be doing this or that merc. would say to put springs on to hold them in.
#10
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Re: Merc. 420 eng. ?
Originally Posted by Lapse of Reason
The guy told him Merc. said they all do it and to put springs on the dip stick to hold it down they only have 206 hrs on them he says, but I don't tink they should be doing this or that merc. would say to put springs on to hold them in.