| Author | Message | ||
     Randy Roberson Grand Master Username: wascator Post Number: 506 Registered: 5-2009 |
Does anyone know offhand the size and grade of the exhaust manifold bolts? I found the top bolt for A1 was missing from my '77 Wraith II after I removed the intake air heater assembly. I suppose it fell out, as there is no broken remnant. Of course, the spacer is lost as well. | ||
| michael vass Experienced User Username: mikebentleyturbo2 Post Number: 27 Registered: 7-2015 |
Hi BOLT.3125UNF X 1.750 LONG Can't help with the spacer but you could measure one already on. Hope that helps Mike | ||
| Randy Roberson Grand Master Username: wascator Post Number: 507 Registered: 5-2009 |
Tremendous help! Thanks a bunch. Regards, Randy | ||
| vincent vitale Unregistered guest Posted From: 68.199.49.246 |
What wrench (AF,whitworth,mm,) and size of bolt head is it? whats better to release bolt: start engine let it run put CB BLASTER on it overnite. or just turn it cold. thanks (Message approved by david_gore) | ||
| Nigel Johnson Prolific User Username: nigel_johnson Post Number: 157 Registered: 12-2008 |
Hi Vincent, 1/2" AF. Soak in penetrating oil overnight. Good luck. Regards, Nigel. | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1550 Registered: 6-2006 |
If it is reluctant to come out, try and grab the spacer and turn bolt and spacer at the same time. Nipping up exhaust manifold bolts and sump bolts are an annual service must. Often the heads are rusted down so you may have to force on a 12mm ring spanner or socket. Use good quality tools. | ||
| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 1027 Registered: 9-2004 |
Six sided in most cases will work. | ||
| Vladimir Ivanovich Kirillov Grand Master Username: soviet Post Number: 526 Registered: 2-2013 |
Exhaust manifold bolts are something put on earth to create pain and anxiety in the minds of mechanics. They are nasty horrid things like an eyeball full of petrol. Randy make sure there is a good thread in the cylinder head before putting a new bolt it and don't put a spring washer on it because that's an exercise in futility. If your thread is gone you will need to helicoil it. Do have fun. | ||
| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 1031 Registered: 9-2004 |
Be careful they are helicoiled from new! | ||
| Vladimir Ivanovich Kirillov Grand Master Username: soviet Post Number: 527 Registered: 2-2013 |
Ekkk ! I hope Randy's thread is still there then or it could be a nasty little little horror story ! | ||
| Randy Roberson Grand Master Username: wascator Post Number: 676 Registered: 5-2009 |
I did confirm the thread is still there. I understand it is not unheard of that on occasion one or more of these bolts will loosen and fall out. My 1970 Shadow had one missing on the B-Bank. As Paul says, they should be nipped up occasionally. The manifold does not leak at all. I will get on this little project I have been putting off and let everyone know the outcome.I have been quite busy with electrical wiring in my new garage-barn and seems there is always something to do. I tried to start the MGB Friday afternoon and fuel started pouring out from the area where the SU fuel pump is mounted. I looked and did not see anything obviously wrong, so this requires further investigation. Always something! | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1552 Registered: 6-2006 |
Give the float chamber a tap with a spanner. May just be a sticky valve or float. The joys of old cars ;) |
