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Author
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Topic: Roller motor trouble
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Kyle
Gearhead Posts: 430
From: Sumner, WA
Registered: Dec 2001
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posted 03-17-2002 01:51 AM
   
I'm having trouble with the 5.0 roller lifter hold-down. I got the short block from a guy in a trade, but it didn't have the hold down or the roller lifters. I got those on an ebay auction. I put them into the block, tightened the two bolts that hold the spyder in place, and turned the cam around. The roller lifters are dropping below the holders when they are at on the base circle of the cam, so that when they come up again, they hit the holders and try to bend the spyder. I talked to a guy around here and he thinks that there were two different types of hold-downs and roller lifters- one for GT models, which he says came with a bigger cam stock (taller lifters), and one for non-GT models (smaller cam and shorter lifters). This doesn't sound quite right to me, but what do you all think? The block is from a '90 Mustang LX, stock cam in place. Don't know what the hold-down and lfters came from, other than a 5.0.
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cpmaverick
Gearhead Posts: 1666
From: Santa Clarita, CA
Registered: Jan 2000
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posted 03-17-2002 02:04 AM
The GT/LX thing is total BS. How did you install the holdown? The metal "x's" are just set over the lifters, and the metal retainer simply bolts on top of them. Are you sure the cam is a roller cam? ------------------
-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.
http://www.maverickgrabber.com
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chips67
Gearhead Posts: 663
From: louisville, ky, usa
Registered: Jul 2001
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posted 03-17-2002 09:13 AM
you shouldnt be having this problem if the parts are right. the top of the lifter should never drop below the top of the bore on the base circle of the cam. wrong cam or wrong lifters.------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.
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Kyle
Gearhead Posts: 430
From: Sumner, WA
Registered: Dec 2001
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posted 03-17-2002 11:32 AM
It's the cam that came in the short block, so I'm sure it's a roller cam. The lifters don't drop below the bore, they drop below the pieces that hold them from twisting in the bore. I installed it just like cpmaveric says.
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futurattraction
Gearhead Posts: 108
From: Iowa City, IA
Registered: Oct 2001
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posted 03-17-2002 05:00 PM
Kyle,
Do you know for a fact that this cam was run in this block? Do you know what the cam actually is? Sorry...I don't mean to grill you, but something definitely doesn't sound right. Retrofit cams often use a reduced base circle to maintain the proper depth of the lifter in the oil gallery when used in a non-roller block (due to the HR lifters greater length). Do you know what kind of lifters were used before? Crane makes linked HR lifters that eliminate the need for the spider and lifter guides. It kind of sounds to me like a reduced base circle cam that's allowing the lifters to drop below the lifter guides. I'll be interested to know what you find out. Best wishes...
Scott
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cpmaverick
Gearhead Posts: 1666
From: Santa Clarita, CA
Registered: Jan 2000
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posted 03-17-2002 08:47 PM
Yeah, how can you be sure it is a roller cam if you got it in a block with no retainers or lifters?
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Kyle
Gearhead Posts: 430
From: Sumner, WA
Registered: Dec 2001
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posted 03-17-2002 09:05 PM
I got the engine from a guy I worked with. He purchased a short block from Schucks, and I traded him his short block core for a 72 short block, which he turned in for core credit. That is why I know the cam is the origional roller cam and why the lifters and retainer didn't come with the block. All came from his 90 Mustang LX. What I don't know is where(or what) the hold-down and lifters came from. Could the hold-down be bent up somehow? Should I try to bend it down?
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cpmaverick
Gearhead Posts: 1666
From: Santa Clarita, CA
Registered: Jan 2000
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posted 03-17-2002 09:48 PM
You don't even need the hold-down to test fit. There's no way the hold down is the problem. You should be able to place the retainers over the lifters witout the hold-down and they should simply stay there. ------------------
-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.
http://www.maverickgrabber.com
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Kyle
Gearhead Posts: 430
From: Sumner, WA
Registered: Dec 2001
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posted 03-18-2002 12:24 PM
If I just lay the retainers on the lifters and turn the cam around, they stay in their places just fine. The hold-down suspends the retainers above the block surface far enough so that the retainers no longer touch the lifters all the time. That's why I think the problem is in the hold-down. So should I go to a junkyard and try to get another hold-down setup?
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