crank endplay

84gt347 · 06-20-2003, 11:46 AM

I was reading a build and the builder was very careful checking crank endplay. The author noted that proper endplay promoted less rolling resistance, less horsepower to turn. I dont understand how to adjust endplay?? Anybody ever tackle a job like that??

andy669 · 06-20-2003, 01:46 PM

Endplay is set by the thrust bearing. (#3 main) I always check the endplay, but I have never had one tight enough where I had to change the clearance.

Andy

bigredstang · 06-20-2003, 02:19 PM

I have seen people hit the ends of the crank with a dead blow type hammer but I dont know if that was to adjust or just to seat the bearings.

84gt347 · 06-20-2003, 02:42 PM

Quote:

Originally posted by andy669
Endplay is set by the thrust bearing. (#3 main) I always check the endplay, but I have never had one tight enough where I had to change the clearance.

Andy

I guess they could be either too tight or too loose?? If you had to adjust it one way or the other, what would you do, hit it with a deadblow hammer like big red

andy669 · 06-21-2003, 08:54 AM

If I had one that was too loose I'd definately get a different set of bearings. If it was too tight I'd find a way to take a couple thou off. Maybe sand it or something.

Andy

PKRWUD · 06-22-2003, 04:17 AM

You won't find it too tight, but when it becomes too loose, you correct it with a new set of main bearings with a thicker (on the side) thrust bearing. Actually, when it becomes too loose, it's probably time for a rebuild, but either way, it's corrected with the thrust bearing.

Take care,
~Chris

Jeff Chambers · 06-22-2003, 08:50 AM

Occasionally you will find the thrust too tight with a new set of bearings. When this happens, you simply sand the thrust bearing surface with some 400-600 grit sandpaper on a granite machinists block or good flat machined surface such as a mill table. For a SBF, the thrust should be about 0.004-0.005" with a manual transmission, just slightly less with an auto trans.

06-20-2003, 11:46 AM	#1
84gt347 Registered Member Join Date: Mar 2002 Location: sherwood Forest Posts: 291	crank endplay I was reading a build and the builder was very careful checking crank endplay. The author noted that proper endplay promoted less rolling resistance, less horsepower to turn. I dont understand how to adjust endplay?? Anybody ever tackle a job like that?? __________________ 84 gt350 89 lx vert 92 lincoln lsc. All Forced ( one way or another)

06-20-2003, 01:46 PM	#2
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Endplay is set by the thrust bearing. (#3 main) I always check the endplay, but I have never had one tight enough where I had to change the clearance. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

06-21-2003, 08:54 AM	#5
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	If I had one that was too loose I'd definately get a different set of bearings. If it was too tight I'd find a way to take a couple thou off. Maybe sand it or something. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

06-22-2003, 04:17 AM	#6
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	You won't find it too tight, but when it becomes too loose, you correct it with a new set of main bearings with a thicker (on the side) thrust bearing. Actually, when it becomes too loose, it's probably time for a rebuild, but either way, it's corrected with the thrust bearing. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

06-22-2003, 08:50 AM	#7
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Occasionally you will find the thrust too tight with a new set of bearings. When this happens, you simply sand the thrust bearing surface with some 400-600 grit sandpaper on a granite machinists block or good flat machined surface such as a mill table. For a SBF, the thrust should be about 0.004-0.005" with a manual transmission, just slightly less with an auto trans. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

06-20-2003, 02:19 PM	#3
bigredstang Registered Member Join Date: Mar 2000 Location: lincoln, NE Posts: 80	I have seen people hit the ends of the crank with a dead blow type hammer but I dont know if that was to adjust or just to seat the bearings.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
crank shaft spacers	BilLster	Windsor Power	0	04-24-2003 02:53 PM
alternator pulley to crank pully ratio	redrider	Windsor Power	0	12-18-2002 11:43 AM
650HP stock block	ultraflo	Windsor Power	73	11-07-2002 11:35 AM
Crank key help "half moon key"	quick89gt	Windsor Power	2	05-05-2002 05:26 PM
69' Steel 302 Crank - Infor anybody?	Shawn	Classic Mustangs	2	08-14-2000 11:09 PM