Tick tick tick update (rod knock) ***putting it back togethe

[Dennyboy]

Re: Tick tick tick update (rod knock)

well there isn't any discoloration i ran it for all of 3 minutes since the noise started. and it spun the bearing and both the ends on on the bearings are destroyed. How much do you think that it would cost me for them to check out the bottom end if i bring it in with just the bottom end in tact? It has all the power that i need right now. i don't plan to drag it just a sturdy street car that i can cruise in and have a little fun.

 

[Likethat]

Re: Tick tick tick update (rod knock)

The rod could have stretched. I would at minimum have the rod resized and checked for cracks or bent. As long as the crank can be turned it will be fine.

Now for the really big question, why did it spin? Oil starvation is number1 for spinning bearing. Over heating number2. Over revving. Then there is pour clearance if rebuilt. Bad parts. This one is out there and rare, to much HP on cheap parts.


I am liking the Pontiac Blue Metallic on the Olds intake.

 

[Likethat]

Re: Tick tick tick

A connecting rod and a lifter make very different sounds. Lifters and rockers "tick" as the title suggests, but a rod "knocks" like a woodpecker on a dead tree. Every spun rod bearing I've ever had could be artificially quieted by adding a can or two of STP to thicken the oil enough so the oil film between the rod and crank prevented metal to metal contact, which is the purpose of oil anyway. I was able to nurse a 400 to work every day until the weather warmed up by keeping the rpm's below 1500, above that it knocked like crazy. Rods usually don't knock at idle if you have decent oil pressure.

that's the thing i have good oil pressure but.... i'm not getting oil to the top of the push rods..... so confusing. also this just started every once and a while it will just stop for like three seconds then come back.

also just for when i start collecting parts. are the bucik,olds and pontiac 455 all the same or is there any difference?

I dont belive the parts are interchangeable...I think maybe pontiac and olds 455's can swap some stuff but the Buick is a beast of its own...

All are different. They share starters, A/C compressors, Alternators, and Carbs to some extent. Of course we are talking stock parts on stock parts not custom parts on modified.

 

[Blake442]

Re: Tick tick tick update (rod knock)

Dennyboy, I probably already asked you this but where in MN are you?

 

[custom442]

Re: Tick tick tick update (rod knock)

Right now you're having to decide between doing it right the first time, and spending less money and time to get the engine back up and running. What concerns me about it is this engine has been run 800 miles. And the point I was trying to stress is it can be the block just as much as it is the rotating assembly that will throw a bearing. Find the most reputable machine shop in your area and pay the bill, unless you've been building for a long time I wouldn't take the chance. And many guys would disagree with me and say put it together yourself but well that's your choice.

 

[G-Body_Vet]

Re: Tick tick tick

I'm with what he says ^^^^^

I'd like to think I'm a fairly competent mechanic, but I'm not a seasoned engine builder. My Pontiac 455 was a good runner when I got it, bearings had almost no wear, good cylinder walls & thickness, but the crank centerline was out of spec. The machinist I chose knows his sh*t and tries to save me money when possible. Unfortunately a line bore was necessary in my case. Without taking this to a shop for a rebuild I probably wouldn't even have thought about this.

the shop has been shut down for the past three months.

Kinda makes you wonder why this ^^^^ happened too. If you don't know the true factual history of the engine or what's been done, I'd say at least let a trained eye check it out. Could be worse, could be better than you think. It just sucks doing and spending twice IMO.

 

[Dennyboy]

Re: Tick tick tick update (rod knock)

ok well do i bring it in apart? or do i bring it in with just the bottom end in tact?

Blake442 im in the lino lakes area know any good places? the shop shut down because the people that ran the store were to old..... I also am pretty sure that it ran along time before i got it.

 

[Bonnewagon]

Re: Tick tick tick update (rod knock)

Too bad about the bearing. Sounds like the original work was faulty. A good machinist will find the culprit. Either the assembly was flawed with bad clearances, or cleaning was lax, or oiling failed. Anyway the right way is to disassemble and start over. But the spun bearing I mentioned occurred in the dead of winter and I needed the car for work, BAD. I had a spare parts 400 so I pulled the motor, removed only the bad rod/piston, and swapped in a spare rod/piston with new bearings and rings on that set only, and polished the crank journal with some emery cloth soaked in oil. Put it back in the car and that baby ran great for years until I sold the motor. It never smoked or made noise. I don't recommend you doing that, but it just shows what works in a pinch.

 

[Dennyboy]

Re: Tick tick tick update (rod knock)

well just got a call from the machine shop. they are pretty sure i stretched a rod bolt. so there gunna get the crank polished up and i'm gunna bring them a new set of rods and there gunna get it together for me. with new bearing and the whole nine yards. they said it had oil (no burn marks). all the other bearings are fine and the clearances where good.

so now my other question there are some C heads around me for sale. which ones are good, what to look for?

 

[Blake442]

Re: Tick tick tick update (rod knock)

I was gonna dig up the info for the place that did my 455 crank in Minneapolis, but it sounds like you got it covered.