engine hard to turn over
#1
engine hard to turn over
Ok guys I replaced the lower rod bearings in my 355, All i replaced is the lower rodbearings, now the motor is very hard to turn over and you have to use a big prybar. This is not normal I am told by many people. Is this normal or what? the motor hasnt been run with the new bearings so I am wondering if its just because they are not on right or what. All main caps were stamped and put back EXACTlLY as they came off.
So is this normal or what>>>
So is this normal or what>>>
#2
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Car: '91 Camaro 305V8, '91 Camaro 3.1V6
Re: engine hard to turn over
Did you platigauge the clearances? Maybe the bearings that you got are for a turned crank, but yours hasn't been turned? Usually they mark the bearings with a number indicating if they are oversized. Did you torque them down to spec? Maybe you overtightened them. Proper torque on bearings is very important.
#3
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Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: engine hard to turn over
What do you mean by "lower rod bearings"? Just one of the shells per bearing? That's not going to work. At this point you should get the crank turned or buy a "crank kit".
#4
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Car: '91 Camaro 305V8, '91 Camaro 3.1V6
Re: engine hard to turn over
I missed the working on that. Rods only have one set of bearings each. You replaced all of the rod bearings right? Also, while you were in there how were the main bearings? You should check the clearance on these as well anytime you remove them.
Also, did you use assembly lube on all the surfaces before putting it all back together? You don't want to install dry bearings. They'll get tore up pretty bad the first time you start it up. Can cause damage to your crank as well.
Also, did you use assembly lube on all the surfaces before putting it all back together? You don't want to install dry bearings. They'll get tore up pretty bad the first time you start it up. Can cause damage to your crank as well.
#5
Re: engine hard to turn over
I lubed them liberally when I installed them, and yes I installe all 16 new ones. Not just the cap half. all of them. Is this normal for a nonbroken in motor?? The crank was turned to 1.0870 on all journels. I bought -.010 sized bearings, sealed pro 2555cp .010 bearings. (federal mogul). I am unsure by what everyone tells me...
Last edited by five7kid; 11-11-2008 at 11:02 AM. Reason: Language
#6
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Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: engine hard to turn over
I lubed them liberally when I installed them, and yes I installe all 16 new ones. Not just the cap half. all of them. Is this normal for a nonbroken in motor?? The crank was turned to 1.0870 on all journels. I bought -.010 sized bearings, sealed pro 2555cp .010 bearings. (federal mogul). I am unsure by what everyone tells me...
Last edited by five7kid; 11-11-2008 at 11:02 AM. Reason: quoted language
#7
Re: engine hard to turn over
The motor is bored .030 over but was broken in since rebuild, I bought the motor rebuilt and broken in. It turned over by hand before, but since the bearings were put in its relativly hard to turn over. I tourque dht erod caps to 45ft pounds in 3 increments.
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#8
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Car: 89 formula/00 z28
Engine: carbed 350/ls1
Transmission: 700r4/ a4
Axle/Gears: 3.23 posi/ 3.73 posi
Re: engine hard to turn over
something aint right if u could turn it over by hand. hards that what u want that why they have to broke in.. i wouldnt worry about it. maybe do what they said above. to be safe.
#10
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Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: engine hard to turn over
You should measure all the bearing clearances with plastigage before you button it up.
#11
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Car: 1991 Chevy Camaro RS
Engine: 350 TPI
Transmission: 700R4,
Axle/Gears: 3.73 w/SLP Zexel Torsen Limited Sli
Re: engine hard to turn over
Can't count the number of times I've seen bearings fail on breakin bc they didn't check the clearences on the bearings. Plasticgage its you rbest friend
#15
Re: engine hard to turn over
worse comes to worse my dad has a freind that runs a 7sec 8th mile car, and he has built a million 350 sbcs'. He will take a look at it if we cant figire uot whats wrong...
#16
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Car: 1991 Chevrolet Camaro RS Red
Engine: 305 V8 TBI
Transmission: TH-700R4
Re: engine hard to turn over
plastigauge is cheap and very cost effective when doing an engine build, we gave a demonstration in class there is 2 to 3 thousandths bearing clearance on the crankshaft, we plastigauged it and that is what we came up with by the book 2 to 3 is good, we removed one rod bearing and installed a piece of notebook paper on a display engine, we also measured this with a dial caliper to 4 thousandths, the engine would spin by hand when the cap was torqued the engine was locked down. so 1 thousandth of an inch will bite you every time.
#17
Re: engine hard to turn over
Ok, I was measuring the bearings thickness that came out of the motor and the new ones I bought yesterday. There were a few old ones that were 2-3 thousandths smaller, This concernes me. I think I am going to buy a new crank, this one is out of wack. I can buy a new Eagle crank for 190$, how much would it cost to turn my stock crank...?
#18
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Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: engine hard to turn over
Around here (MA) it costs about $160 to have one turned.
#19
Re: engine hard to turn over
ok, hopefully its cheaper here. I will have to call a local engine building shop and have them look at it... Now I am guessing i will need .020 undersized bearings....
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