• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

100-4 front main bearing cap issue

WaltCasten

Jedi Trainee
Offline
Hello all,
My BN2 is being restored and I am trying to re-gasket the engine while it is out. One issue I have run into is the front main bearing cap stands proud of the front surface of the block by .010". The rear one was flush. FYI, this engine was rebuilt back in the late 1970s. Anyway, it appears the engine was leaking from this area so I would like to address this somehow.

Is it possible to loosen the front main cap bolts and tap this back flush? Even if possible is this a bad idea? Should I just silicone this area and be done with it? It seems like one would want a nice flat surface for the front mounting plate to be bolted to.

Any help is appreciated.
Thanks,
Walt
 

Keoke

Great Pumpkin
Country flag
Offline
Yes I think as far as realigning the cap it can be done as you suggested, However, concerning the leak at this bearing I do not know how any sealant would help.-Fwiw--Keoke
 

BoyRacer

Jedi Warrior
Country flag
Offline
I don't see any problem with your solution - if it works. The main bearing caps usually fit so tight that there is not much run for movement. If it doesn't get flush, you could remove it and have it milled down. Silicone is really great stuff but If it was my engine I would want a flush fit.
 
OP
W

WaltCasten

Jedi Trainee
Offline
Well, loosening the nuts and tapping it back isn't an option. It appears there isn't enough clearance around the nut for the cap to move anywhere. There is a spot face where the nut bears, then a shroud of cast material around that area that wasn't machined. The apexes of the nut hit that shroud when you try to tap it back. You can move it back about .005" with the nuts loose, then as soon as you tighten them it goes right back to the .010".

I guess my only option to make it right is to either have a machine shop cut the .010" off the front or open up the spot face around the nut.
 

Keoke

Great Pumpkin
Country flag
Offline
I guess my only option to make it right is to either have a machine shop cut the .010" off the front or open up the spot face around the nut.

Either one sounds like agood way to go .However, I like opening up the spot face the best.--Keoke
 
OP
W

WaltCasten

Jedi Trainee
Offline
The machine shop also suggested just putting a ground and hardened washer under the nut. They did not have an ARP washer with that big an ID, fortunately I have a Fastenal right across the parking lot from where I work so I went that route. There was a metric size that was really close, I had to open the ID up a little. I re-assembled, torqued it to 75 ft-lbs and the cap now sits flush.

It was also suggested to chuck the nuts up in a lathe and take a little off the apexes down at the bottom as the socket can't reach down there anyway because of the cast material (shroud around the spot face).

If anyone thinks the washer is a bad idea, let me know asap as I plan on buttoning this thing up tomorrow.

Thanks for all the input!

Later,
Walt
 
Similar threads
Thread starter Title Forum Replies Date
L 100/6 replacement front seats Austin Healey 7
L Denis Welch Front Disc Conversion Kit 100/6 Austin Healey 6
M 100 Front Hub Spacer/Distance Piece Austin Healey 2
C 100-6 front drum brakes? Austin Healey 36
A Wanted Front Bumper Brackets/Spring bar assembly for 100-6 Austin Healey Classifieds 0
L Front Brake 100/6 Austin Healey 1
D front shocks 100 m Austin Healey 12
T Front transmission seal not on 100-6 Austin Healey 2
C AH 100 Best Options for front and rear suspension? Austin Healey 9
cmc140 Austin-Healey 100 front splash pan / splash shield question. Austin Healey 8
T 100 4 Front Sway Bar Austin Healey 12
M 100-4 BN2 Front Fender with extra Groove Austin Healey 2
bighealeysource front disc brakes conversion for 100-4 Austin Healey 21
Y Restoring a 58 100 six front shroud Austin Healey 1
R 100-4 front fender removal Austin Healey 2
T 100 Front Shroud Attachment Austin Healey 0
M Healey 100-4 Front Spring Stiffness Austin Healey 2
bighealeysource 100-4 front shock replacement Austin Healey 2
H Healey 100 Front Wheel Bearing replacement Austin Healey 4
bighealeysource Removing front shocks on a 100 -4 Austin Healey 12
S 100/4 front suspension/Mt Washington Hill Austin Healey 3
J Does anyone need a front valance for a 100-4? Austin Healey 1
mbrooks 100 oil leak from front of engine Austin Healey 3
Editor_Reid Healey 100 Front Springs Austin Healey 7
timbn2 Front Shroud for 100 Austin Healey 2
J Owners of my 100-4 Austin Healey 1
andrea AH 100/6 1957 Longbridge Photo Albums Austin Healey 5
H 100-6 Interior Installation Austin Healey 4
B Overcooling Healey 100 Austin Healey 13
BoyRacer Nissan/Datsun engine swap into a 100/4? Austin Healey 30
Michael Oritt 100 Windshield seal Austin Healey 0
madhouse 100-Six Side Curtains Austin Healey 8
C 100/6 BN4 Soft Top Frame Austin Healey 7
Editor_Reid Healey 100 Chassis Dimensions Austin Healey 5
Martinld123 Healey 100 BN2 Water Pumps Austin Healey 9
steveg 100-4 Distributor Internal Ground Wire Austin Healey 6
dougie Austin-Healey 100 Documentary Austin Healey 3
T Wanted Looking for a solid [but doesn't have to be perfect] 100-6 Austin Healey Classifieds 16
H 100-6 Austin-Healey Austin Healey 7
K 100/6 Stamped Numbers Austin Healey 6
R Wanted 100 side curtains Austin Healey Classifieds 9
HealeyRick Streamlined 100-Sixes Austin Healey 0
DerekJ Fitting a 100-Six grille. Austin Healey 10
T Pertronix distributor install into Austin Healey 100/6 Austin Healey 12
G Looking for upholsterer recommendation for Healey 100 in Southern California Austin Healey 5
S For Sale Austin Healey 100-4 Factory Parts Manual on CD/ROM Austin Healey Classifieds 0
S For Sale Austin Healey 100-4 Factory Workshop Manual on CD/ROM Austin Healey Classifieds 0
S For Sale Austin Healey 100-6 and 3000 Factory Service Manual on CD/ROM. Austin Healey Classifieds 0
Lin Spruce Green Healey 100 Austin Healey 17
Michael Oritt 100 throttle linkage--help needed Austin Healey 3

Similar threads

Top