New Noise - Part 2 another new noise

Post by **MattH** » Mon Feb 09, 15 10:40 am

Started the Chally after a few weeks of lay up, got a slight ticking when putting in gear, but not in P.
Checked flex plate bolts, one slightly loose but not touching anything.
Now start it and ticking is much louder, goes with engine speed. I havent driven it other than into the garage.
Sounds possibly like something on the top end. Time for rocker covers off i think

Dave-R · Post by **Dave-R** » Mon Feb 09, 15 11:13 am

It'll just be an exhaust manifold gasket blowing a bit.

Flex plate bolts need to be secure and WELL clear of hitting anything as (particularly under braking) the plate flexes forward and the bolt heads can hit the block.

Dave-R · Post by **Dave-R** » Mon Feb 09, 15 11:15 am

The correct flex plate bolts have a very shallow head for clearance. Never use normal bolts.

Pete · Post by **Pete** » Mon Feb 09, 15 12:01 pm

Agreed.

Header gasket first check.....

MilesnMiles · Post by **MilesnMiles** » Mon Feb 09, 15 12:34 pm

Could also be a lazy lifter if its been laid up a while. My truck always had a bit of a top end rattle, just one lifter that was slow to pump up.
I started my 34 up just yesterday in very cold temperatures and the lifters were a little noisy before calming down.

Post by **MattH** » Mon Feb 09, 15 12:38 pm

My hope was gasket, as I have given that advice myself before, but this sounds a bit noisier. I did wonder about a lazy lifter, and the noise goes off occasionally but not for long. I let it warm up for 10 minutes and it got no better.
It does sound rather metallic. Jack has videoed it so can try to post the noise later. You can hear it with the hood shut.

Dave-R · Post by **Dave-R** » Mon Feb 09, 15 12:46 pm

A blown manifold/header gasket does sound metallic. Like a "clack clack clack".

MilesnMiles · Post by **MilesnMiles** » Mon Feb 09, 15 12:57 pm

Matt, drive it down the road. If its an exhaust gasket it will certainly let you know when under load.

RobTwin · Post by **RobTwin** » Mon Feb 09, 15 1:23 pm

MilesnMiles wrote:Matt, drive it down the road. If its an exhaust gasket it will certainly let you know when under load.

Our Polara has a bit of a leak on one exh manifold gasket and 'ticks' quite loudly when idling, but the tick disappears at speed as the frequency increases.

If it was this, Matt, surely the noise would be there in gear and in Park - it is on ours

Dave-R · Post by **Dave-R** » Mon Feb 09, 15 1:27 pm

It can be louder under load. Putting it in gear creates a load.

Post by **MattH** » Thu Feb 12, 15 12:15 pm

It sounds awful, but I had the covers off and all looks good.
Now pulled the manifold on the pass side and I may have the wrong manifolds as the port shape is different, meaning there is very little gasket or sealing area at the bottom.

Does this manifold look familiar, is it a 360 maybe? The other side has the outlet at the back not the middle.

I think it may be time for some proper gaskets and fit the headers at the same time.

Post by **MattH** » Thu Feb 12, 15 12:34 pm

Ive found the casting numbers on these manifolds,

2- 670337-3

and 404_488 with a date of 1976.
(the dash is an unreadable number)
Of course all the casting number lists i can find stop at 1973

Post by **MattH** » Thu Feb 12, 15 12:39 pm

This is the headers I have, slightly different port shape.

morgan · Post by **morgan** » Thu Feb 12, 15 1:18 pm

RobTwin wrote:
MilesnMiles wrote:Matt, drive it down the road. If its an exhaust gasket it will certainly let you know when under load.
Our Polara has a bit of a leak on one exh manifold gasket and 'ticks' quite loudly when idling, but the tick disappears at speed as the frequency increases.

If it was this, Matt, surely the noise would be there in gear and in Park - it is on ours

Ditto. Same on mine.
I too thought it was something more terminal. They are devils to seal.

Dave81 · Post by **Dave81** » Thu Feb 12, 15 1:32 pm

I cant find your build thread Matt.....Is it a BB car or SB?