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351W problems... Problem solved!

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85bigblockfox
maverick
supervel45
Larry Williams
dfree383
kim
DaveMcLain
rmcomprandy
gmsmkr
jbozzelle
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Post  rmcomprandy August 28th 2015, 10:33 am

jbozzelle wrote:Guys,

Need some help here.

351W.  Basic stock rebuild.  Fired up and showed good oil pressure on gauge but rolled the cam bearings in their journals and showed lack of oil on the main and rod bearings...

Give me some things to check.  Engine is out and apart right now.  Just looking to make sure this doesn't happen again when I reassemble it....

Thanks in advance

Is this a remote oil filter...?
Where is the point of oil pressure taken...?

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Post  maverick August 28th 2015, 11:07 am

Are you sure the cam bearing oil holes were correctly aligned by the builder before you swapped cams? They may have been wrong to begin with.
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Post  jbozzelle August 28th 2015, 11:35 am

rmcomprandy wrote:
jbozzelle wrote:Guys,

Need some help here.

351W.  Basic stock rebuild.  Fired up and showed good oil pressure on gauge but rolled the cam bearings in their journals and showed lack of oil on the main and rod bearings...

Give me some things to check.  Engine is out and apart right now.  Just looking to make sure this doesn't happen again when I reassemble it....

Thanks in advance

Is this a remote oil filter...?
Where is the point of oil pressure taken...?

stock location filter and pressure taken right above filter...

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Post  jbozzelle August 28th 2015, 11:37 am

maverick wrote:Are you sure the cam bearing oil holes were correctly aligned by the builder before you swapped cams?  They may have been wrong to begin with.

No clue... Thinking holes may have been off or partially covered or maybe the feed holes from main saddles were clogged... can't tell anything now since the bearings spun...

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Post  85bigblockfox August 28th 2015, 11:47 am

Old engines I tear down and put rings and bearings in I take the block to the car wash. You can put the car wash wand in the filter hole and sometimes its amazing what blows out of there.
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Post  jbozzelle August 28th 2015, 11:57 am

85bigblockfox wrote:Old engines I tear down and put rings and bearings in I take the block to the car wash. You can put the car wash wand in the filter hole and sometimes its amazing what blows out of there.

Yep, I do the same on the engine stand with a blow gun attachment that also pulls solvent from a jug at the same time...

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Post  supervel45 August 28th 2015, 12:25 pm

That's all fine and well, but run a brush through them too. The old oils would get caked up in there real bad, and it can be very hard to clean.

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Post  bbf-falcon August 28th 2015, 10:46 pm

Yes brush each and every hole in block,and clean brush w/cleaning solution after each stroke.

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Post  FalconEh August 28th 2015, 11:49 pm

Were the cam journals mic'd before bearing installation? The few thou could have been on the OD
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Post  maverick August 29th 2015, 12:24 pm

I'm back to the "bearings were put in wrong" idea. Since there's no sign of scuffing in the bores, maybe they didn't spin after all.Suspect
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Post  jbozzelle September 1st 2015, 12:44 pm

The journals on the cam look fine. I haven't been able to get to the shop to knock out the bearings to see what the bores in the block look like.


And yes, I clean the block with brushes and solvent. Only way to go....

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Post  Inthegarage September 5th 2015, 2:56 pm

As stated make sure all oil passages are clear....Do you prime your motors before starting them ?? For me it proven to be well worth the time..........

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Post  Inthegarage September 11th 2015, 10:55 pm

Have you checked for a collapsed oil filter ?? It happens more than you think.............

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Post  jbozzelle March 7th 2016, 5:28 pm

Finally dropped this off at the shop last week to get it tanked and some new bearing put in.

The guys at the shop all said too much spring pressure... Not sure I agree since the hyd flat tappet can was perfect looking...

Thoughts? Could too much spring pressure caused just a stock replacement cam bearing to fail?

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Post  QtrWarrior March 7th 2016, 9:37 pm

jbozzelle wrote:Finally dropped this off at the shop last week to get it tanked and some new bearing put in.  

The guys at the shop all said too much spring pressure...  Not sure I agree since the hyd flat tappet can was perfect looking...

Thoughts?  Could too much spring pressure caused just a stock replacement cam bearing to fail?

No.

Think about it..we use HUGE roller springs on our big blocks and don't have that issue..
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Post  jbozzelle March 7th 2016, 9:55 pm

QtrWarrior wrote:
jbozzelle wrote:Finally dropped this off at the shop last week to get it tanked and some new bearing put in.  

The guys at the shop all said too much spring pressure...  Not sure I agree since the hyd flat tappet can was perfect looking...

Thoughts?  Could too much spring pressure caused just a stock replacement cam bearing to fail?

No.

Think about it..we use HUGE roller springs on our big blocks and don't have that issue..

That's what I said.....

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Post  jbozzelle March 22nd 2016, 4:42 pm

Dragging this back up because we figured out what happened.

The crank was turned .020/.020 and had .010 rod bearings on it. Not sure on the mains. Those were tossed in the trash by the shop when the block was tanked.

So I feel better knowing what happened. Makes me know I shouldn't have any issues when I reassemble it here in another week or so...

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Post  supervel45 March 22nd 2016, 5:37 pm

Ooch, Well at least you got it figured out.

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Post  maverick March 22nd 2016, 7:12 pm

How in the HELL does one put .010 bearings on an .020 crank...and then button it all up as if everything is hunky-dory?? scratch
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Post  jbozzelle March 22nd 2016, 7:44 pm

Honest mistake i guess.

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Post  supervel45 March 22nd 2016, 9:11 pm

Fired! Next.

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Post  jbozzelle March 25th 2016, 9:19 am

The funniest thing about all of this is that my Dad and I chased our tail thinking the timing was off since it only "rattled" once the rpms were up past 3500...

I mean we flat out argued about whether or not he put the right timing pointer on it with the correct balancer, etc... LOL

Now, we know what the rattling was all about... Damn thing had decent oil pressure for a good few weeks too. Once the oil pressure went to shit we knew it wasn't ignition timing...

Waiting on new bearings to arrive and it's all going back together here soon. Had Blake grind me a nice custom hyd roller too. Hoping to get it in my 78 Futura in time to bring it to the race at US60...

And the guy who assembled it passed away last year. Was a good guy too that ran one of the best machine shops around for years. Damn cancer got to him. He assembled this one when he was in and out of the hospital. Can't really blame him for the mess up. He was just doing what he loved for as long as he could...

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Post  supervel45 March 25th 2016, 8:35 pm

Sorry to hear about your machinist RIP. You will likely be like me and have a hard time finding another good one.

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