rod bearing problem!!

[dsmGSTtuner]

okay so i took off my oil pan and found out that all four of my rod bearing caps can move back and forth( towards the turbo then back towards the exhaust). Is it normal for this to happen? the engine is rebuilt and has like 5 miles on it. it was making a rod knock noise or anything. all four rods can move the same amount. any help please?

 

[92AWDHX40]

What did you do when you built the bottom end, did you measure everything and torque everything correctly?

 

[bryanwheat]

They should move side to side towards the flywheel and crank pulley, but there should no noticeable movement from front to rear. IF there is than something is wrong.

 

[dsmGSTtuner]

i bought the engine after it was rebuilt. i didnt do the work.

 

[92AWDHX40]

Oh so you have no idea, any pics that would help, so we can visually see the situation.

 

[ed1380]

You can unbolt the cap and just look at the bearing. The bearing half in the rod wears out the fastest.

 

[BogusSVO]

When you bought the engine, what were you told was done?

 

[HIGHPSI4]

No. There can be a little side to side movement along the crank journal but there should not be any noticeable movement perpendicluar to the crank. The oil film gap between the bearing and journal is very tight. As stated above, pull the caps and see what is happening.

 

[dsmGSTtuner]

When I bought the engine I was told it was completely rebuilt. The inside of the engine is really clean. I could even see the tops of the pistons were clean.

I wish I could upload a video or pic but i cant right now. What should I do?

What does it usually mean if they can move a little back and forth (towards turbo and back towards intake manifold)? If worse comes to worse how bad is it to change out the rod bearings?

 

[92AWDHX40]

Well it depends. http://www.dsmtuners.com/forums/newbie-forum/342915-how-hard-replace-rod-bearings.html


How to Change Connecting Rod Bearings | eHow.com

Well this is some good reading, i say pull engine and see for yourself how everything looks since your unsure of what you bought. It can be done did mine with the engine tore down, i chance nothing with a used engine so i rebuild the ones i acquire.

 

[dsmGSTtuner]

well i guess ill pull the bearing caps and see what they look like. any one have a pic what bad bearing caps/ worn crank would look like?

 

[92AWDHX40]

GRooves in them, and not normal look at some pics on google for more claification.

 

[BogusSVO]

Both the rod throw on the crank, and the rod housing bore should be smooth.

If any sort of texture to either surface, that part needs machined or replaced.

 

[dsmGSTtuner]

I bought a rebuilt 4g63 and I took off the oil pan and checked out the connecting rod bearings. From what I could gather the bearing clearance should be 0.002 right? Well mine is 0.004!

I checked the bearings and they didn't look really worn down. All four connecting rods had some play. I could move them a little bit in perpendicular to the crank (towards the turbo and back towards the intake manifold)

I understand there is thrust play but this isn't it. I'm thinking maybe the person who rebuilt the engine didn't put the correct bearings in it. The bearings I have have this written on them...
my03
1185H
ACL
STD
In that order on the back side of the bearing. Can somebody give me some help please

 

[crimsondragon]

That part number correlates to ACL standard size bearings for a 7 bolt motor. I'm assuming it's a 7 bolt motor correct? How did you check the clearance?

 

[dsmGSTtuner]

Yea its a 7-bolt. I used a plastic gauge. I measured it three times and torqued it to specs each time. I think I might need a bigger bearing, wouldn't you think so?

 

[BogusSVO]

You may be able to find a set of +.001 bearings. Clevite does not have a listing for +.001 rod bearings.

Sounds like the crank has been polished a time or two

The proper fix will be to remove the crank and have it ground .25mm/.010 and get matching bearings.

How was your oil pressure?
Cold idle?
Warm Idle?
Cruise?
WOT?

 

[crimsondragon]

Manual states initial oil clearances should be between .0008 to .002 with .004 being the limit. Although on the loose side I think it should be fine.

 

[dsmGSTtuner]

well my book states that .004 is the service limit. where did you see that it should be between .002 and .005 crimsondragon? Also bogus, i can get +0.001 bearings? do you know where at? and is it called and undersize bearing or oversize bearing? heck if i can just get a hold of those im sure that will fix the problem.

 

[jimbob_843]

How many miles are on the motor? It it been ran awhile that way and no markings or wearing have occurred then it should be fine. I would make sure its 100% before giving it the ok, but if its at the limit, has miles on it, and appears to be ok then you should be fine. Just use some thicker oil or somethin. Oh and im not too far away from you, need some help lemme know, i need a reason to use my new brownline digi torque wrench.

 

[dsmGSTtuner]

haha! i here that! well the motor was rebuilt and i havent put any miles on it. I just cranked it up and let it run for about 20 mins. the bearing did show some marking on them though. im just goin to put in some +.001 bearings. that should put me at .03 clearance. But hey jimbob, i might need your help with a couple things and ill give you some gas money. Good to know there is a fellow DSMer in the area bro!!

 

[dsmGSTtuner]

will a set of Cosworth Rod Bearing (part number pr7893) size 0, work in a 95 4g63? the are listed for evo 4g63s. Im hoping they work because if they do then they will be perfect for what i need.

 

[bryanwheat]

Those are ridiculously priced, 80 dollars for a set of rod bearings is outrageous. Get a set of acl alumiguide bearings for around 20 bucks.

 

[dsmGSTtuner]

yea but i need them in a size 0. i need a bearing that has .001 less oil clearance then stock

 

[bryanwheat]

yea but i need them in a size 0. i need a bearing that has .001 less oil clearance then stock

You want less clearance? Do you have wear on the crank or what?